Properties of the Number 20257

Twenty Thousand Two Hundred Fifty-Seven

Basics

Value: 20256 → 20257 → 20258

Parity: odd

Prime: No

Previous Prime: 20249

Next Prime: 20261

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 47 × 431

Divisors: 1, 47, 431, 20257

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111100100001

Octal: 47441

Duodecimal: B881

Hexadecimal: 4f21

Square: 410346049

Square Root: 142.32708807532038

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

Row sums of the Sheffer triangle (exp(x), exp(3·x)-1) given in A282629. A284859

a(n) = 3·a(n-1) - 2·a(n-2) - a(n-3) + a(n-4) with n>3, a(0)=1, a(1)=2, a(2)=3, a(3)=7. A131300

Numbers k such that 13k = 6j² + 6j + 1. A106390

Numbers n such that there is an integer k with the property that k^τ(n) = σ(n). A225239

Numbers n such that φ(2n+1) = σ(n). A67229

Powers of sqrt(17) rounded to nearest integer. A17956

Powers of sqrt(17) rounded up. A17957

Powers of fourth root of 17 rounded to nearest integer. A18094

Index of the first occurrence of prime(n) in A060324. A78454

Column 5 of triangle A091602. A91608