Properties of the Number 20931

Twenty Thousand Nine Hundred Thirty-One

Basics

Value: 20930 → 20931 → 20932

Parity: odd

Prime: No

Previous Prime: 20929

Next Prime: 20939

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 6977

Divisors: 1, 3, 6977, 20931

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000111000011

Octal: 50703

Duodecimal: 10143

Hexadecimal: 51c3

Square: 438106761

Square Root: 144.67549896233294

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of partitions of n where the difference between consecutive parts is at most 6. A238866

E.g.f. satisfies: A(x) = exp(x·A(((x+1)⁸-1)/8)). A143639

Number of (w,x,y) with all terms in {0,...,n} and |w-x| + |x-y| + |y-w| < w+x+y. A213488

Magic sums of 3 X 3 semimagic squares composed of odd squares. A269297

Indices of primes in sequence defined by A(0) = 17, A(n) = 10·A(n-1) - 33 for n > 0. A102013

Centered pentagonal numbers which are semiprimes. A382132

Terminating decimals of length n of form p/5^q using at most one of each nonzero digit. A27905

Expansion of 1/(1-x·sqrt(4·x²+1)-2·x²). A249512

Partial sums of A253086. A255150

Centered pentagonal numbers which are squarefree semiprimes. A381043