20906 (number)
20,906 (twenty thousand nine hundred six) is an even fivedigits composite number following 20905 and preceding 20907. In scientific notation, it is written as 2.0906 × 10^{4}. The sum of its digits is 17. It has a total of 2 prime factors and 4 positive divisors. There are 10,452 positive integers (up to 20906) that are relatively prime to 20906.
Basic properties
 Is Prime? No
 Number parity Even
 Number length 5
 Sum of Digits 17
 Digital Root 8
Name
Short name  20 thousand 906 

Full name  twenty thousand nine hundred six 
Notation
Scientific notation  2.0906 × 10^{4} 

Engineering notation  20.906 × 10^{3} 
Prime Factorization of 20906
Prime Factorization 2 × 10453
Composite numberω(n)  Distinct Factors  2  Total number of distinct prime factors 

Ω(n)  Total Factors  2  Total number of prime factors 
rad(n)  Radical  20906  Product of the distinct prime numbers 
λ(n)  Liouville Lambda  1  Returns the parity of Ω(n), such that λ(n) = (1)^{Ω(n)} 
μ(n)  Mobius Mu  1  Returns:

Λ(n)  Mangoldt function  0  Returns log(p) if n is a power p^{k} of any prime p (for any k >= 1), else returns 0 
The prime factorization of 20,906 is 2 × 10453. Since it has a total of 2 prime factors, 20,906 is a composite number.
Divisors of 20906
4 divisors
τ(n)  Total Divisors  4  Total number of the positive divisors of n 

σ(n)  Sum of Divisors  31362  Sum of all the positive divisors of n 
s(n)  Aliquot Sum  10456  Sum of the proper positive divisors of n 
A(n)  Arithmetic Mean  7840.5  Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n)) 
G(n)  Geometric Mean  144.5890728928  Returns the nth root of the product of n divisors 
H(n)  Harmonic Mean  2.6664115808941  Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors 
The number 20,906 can be divided by 4 positive divisors (out of which 2 are even, and 2 are odd). The sum of these divisors (counting 20,906) is 31,362, the average is 784,0.5.
Other Arithmetic Functions (n = 20906)
φ(n)  Euler Totient  10452  Total number of positive integers not greater than n that are coprime to n 

λ(n)  Carmichael Lambda  10452  Smallest positive number such that a^{λ(n)} ≡ 1 (mod n) for all a coprime to n 
π(n)  Prime Pi  ≈ 2357  Total number of primes less than or equal to n 
r_{2}(n)  Sum of 2 squares  8  The number of ways n can be represented as the sum of 2 squares 
There are 10,452 positive integers (less than 20,906) that are coprime with 20,906. And there are approximately 2,357 prime numbers less than or equal to 20,906.
Divisibility of 20906
m  2  3  4  5  6  7  8  9 

n mod m  0  2  2  1  2  4  2  8 
The number 20,906 is divisible by 2.
Classification of 20906
By Arithmetic functions
 Semiprime
 Deficient
Expressible via specific sums
 Polite
By Powers
 Square Free
Base conversion (20906)
Base  System  Value 

2  Binary  101000110101010 
3  Ternary  1001200022 
4  Quaternary  11012222 
5  Quinary  1132111 
6  Senary  240442 
8  Octal  50652 
10  Decimal  20906 
12  Duodecimal  10122 
16  Hexadecimal  51aa 
20  Vigesimal  2c56 
36  Base36  g4q 
Basic calculations (n = 20906)
Multiplication
n×yn×2  41812 

n×3  62718 
n×4  83624 
n×5  104530 
Division
n÷yn÷2  10453.000 

n÷3  6968.666 
n÷4  5226.500 
n÷5  4181.200 
Exponentiation
n^{y}n^{2}  437060836 

n^{3}  9137193837416 
n^{4}  191022174365018896 
n^{5}  3993509577275085039776 
Nth Root
^{y}√n^{2}√n  144.5890728928 

^{3}√n  27.54801528956 
^{4}√n  12.024519653308 
^{5}√n  7.3123031725293 
20906 as geometric shapes
Circle
Radius = nDiameter  41812 

Circumference  131356.2720319 
Area  1373067111.5494 
Sphere
Radius = nVolume  38273788045403 

Surface area  5492268446.1977 
Circumference  131356.2720319 
Square
Length = nPerimeter  83624 

Area  437060836 
Diagonal  29565.548734972 
Cube
Length = nSurface area  2622365016 

Volume  9137193837416 
Space diagonal  36210.254183035 
Equilateral Triangle
Length = nPerimeter  62718 

Area  189252893.48763 
Altitude  18105.127091517 
Triangular Pyramid
Length = nSurface area  757011573.95053 

Volume  1076828620575.5 
Height  17069.677520875 
Cryptographic Hash Functions
md5  518d52eee664842ce523e2cce507315c 

sha1  5a3ab81a55b0f6612f7067840f77660081316587 
sha256  2564fce3a8ec5823a6354cae2f2741834cb6545d164cba41ddd79b1855c5e8a7 
sha512  fbacf7c5692e752a4a68fe09521956fb3cbbb56f01e9d1909c67bea0095cd5e7333d301c6802358d1d19dc7666ba708ac2a8baf9d84c488c2f9d34e5f17919a3 
ripemd160  8b36fbaa94d459eff2481ae1920f9589299f7771 