Properties of the Number 20951

Twenty Thousand Nine Hundred Fifty-One

Basics

Value: 20950 → 20951 → 20952

Parity: odd

Prime: No

Previous Prime: 20947

Next Prime: 20959

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 7 × 41 × 73

Divisors: 1, 7, 41, 73, 287, 511, 2993, 20951

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000111010111

Octal: 50727

Duodecimal: 1015B

Hexadecimal: 51d7

Square: 438944401

Square Root: 144.74460266275906

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 ways to write n as an ordered sum of 7 primes. A340963

Truncated square pyramid numbers: a(n) = ∑_{k = n..2·n-1} k². A50410

Pell pseudoprimes: odd composite numbers n such that P(n)-Kronecker(2,n) is divisible by n. A99011

Number of n-covers of an unlabeled 3-set. A5745

Sum of all the parts in the partitions of n into 4 parts. A308775

Composite numbers k such that Pell(k) == 1 (mod k). A319042

a(n) = A118478(n)*(A118478(n)+1) divided by the product of the first n primes. A215021

Numbers with ordered partitions that have periods of length 5. A178572

Number of (w,x,y) with all terms in {0,...,n} and w ≠ max(|w-x|, |x-y|). A213501

Maximum value of the cyclic convolution of the first n positive integers with themselves. A294172