Properties of the Number 20624

Twenty Thousand Six Hundred Twenty-Four

Basics

Value: 20623 → 20624 → 20625

Parity: even

Prime: No

Previous Prime: 20611

Next Prime: 20627

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 1289

Divisors: 1, 2, 4, 8, 16, 1289, 2578, 5156, 10312, 20624

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010010000

Octal: 50220

Duodecimal: BB28

Hexadecimal: 5090

Square: 425349376

Square Root: 143.61058456812992

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

Numbers n such that n¹⁰²⁴ + 1 is prime (a generalized Fermat prime). A57002

Numbers k such that k and k+1 are both in A376616. A376793

Position of 3ⁿ in A051037 (5-smooth numbers). A188426

Numbers k such that both k and k+1 are not exponentially squarefree numbers. A342188

a(n) = 625·n - 1. A158374

Engel expansion of exp(e). A96194

Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having abscissa of the first peak equal to k. A108438

Triangular array read by rows: T(n,k) = the number of closed meanders with n top arches and k closed meanders in the reduction of the closed meander by the reverse of the exterior arch splitting algorithm. A363910

Smallest nonempty set S containing prime divisors of 9k+2 for each k in S. A20624

Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the lower median minus the upper median of every 2X2 subblock. A236698