Properties of the Number 20546

Twenty Thousand Five Hundred Forty-Six

Basics

Value: 20545 → 20546 → 20547

Parity: even

Prime: No

Previous Prime: 20543

Next Prime: 20549

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 10273

Divisors: 1, 2, 10273, 20546

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101000001000010

Octal: 50102

Duodecimal: BA82

Hexadecimal: 5042

Square: 422138116

Square Root: 143.33875958721003

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

G.f.: ∑_{n >= 1} xⁿ/(1-xⁿ)⁵. A73570

Semiprimes in A007504 (the sum of first n primes). A189072

a(n) = ∑_d∣n d^{2*(n/d - 1}). A308692

Number of peaks at even levels in all hill-free Dyck paths of semilength n+2 (a hill in a Dyck path is a peak at level 1). A114590

a(n) = ∑_d∣n (-1)^n/d-1 * binomial(d+3,4). A366814

Number of 3n-length 8-ary words, either empty or beginning with the first letter of the alphabet, that can be built by repeatedly inserting triples of identical letters into the initially empty word. A218478

A Fine number related number triangle. A124392

Composite numbers n such that ∑_{k = 0..n} (-1)^k * C(n,k) * C(2·n,k) == -1 (mod n³) (see A234839). A268303

Number of walks within N³ (the first octant of Z³) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 1, 0), (1, 0, 0), (1, 1, -1)}. A148059

4th Bernoulli polynomial evaluated at x=n! (multiplied by 30). A20546