Properties of the Number 20258

Twenty Thousand Two Hundred Fifty-Eight

Basics

Value: 20257 → 20258 → 20259

Parity: even

Prime: No

Previous Prime: 20249

Next Prime: 20261

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 7 × 1447

Divisors: 1, 2, 7, 14, 1447, 2894, 10129, 20258

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111100100010

Octal: 47442

Duodecimal: B882

Hexadecimal: 4f22

Square: 410386564

Square Root: 142.33060106667153

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

Lengths of runs of the initial digits of semiprimes in decimal representation, cf. A239634. A239639

Number of parts in all partitions of n with largest multiplicity nine. A320379

a(n) = binomial(3·n,n)/(2·n+1) (enumerates ternary trees and also noncrossing trees). A1764

Choix de Bruxelles (version 1): irregular table read by rows in which row n lists all the legal numbers that can be reached by halving or doubling some substring of the decimal expansion of n. A323286

Number of permutations of [1..n] which avoid 4231 and 42513. A98746

Strong pseudoprimes to base 32. A20258