Properties of the Number 20156

Twenty Thousand One Hundred Fifty-Six

Basics

Value: 20155 → 20156 → 20157

Parity: even

Prime: No

Previous Prime: 20149

Next Prime: 20161

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5039

Divisors: 1, 2, 4, 5039, 10078, 20156

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111010111100

Octal: 47274

Duodecimal: B7B8

Hexadecimal: 4ebc

Square: 406264336

Square Root: 141.9718281913704

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

q-Fibonacci numbers for q=5, scaling a(n-2). A15462

Number of integer partitions whose sum plus co-rank is n, where co-rank is maximum of length and largest part. A325193

Triangle T(n,k) giving the largest member of "the infinite trunk of factorial beanstalk" (A219666) whose factorial base representation contains n digits (A084558) and the most significant such digit (A099563) is k. A230429

Numbers n such that (σ(n-2)+σ(n+2))/2 = σ(n). A99631

a(n+3) = 2a(n+2) - 3a(n+1) + 2a(n); a(0) = 1, a(1) = 3, a(2) = 4. A105579

Expansion of x²*(-3+4·x)/(1-x³+x⁴). A110061

a(n) is the number of terms in the expansion of (x-y)*(x⁴-y⁴)*(x⁹-y⁹)*...*(x^n²-y^n²). A225549

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

Positive numbers k such that k and 3·k are anagrams in base 8 (written in base 8). A23074

Number of 4-step one space at a time bishop's tours on an n X n board summed over all starting positions. A187157