Properties of the Number 20566

Twenty Thousand Five Hundred Sixty-Six

Basics

Value: 20565 → 20566 → 20567

Parity: even

Prime: No

Previous Prime: 20563

Next Prime: 20593

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 7 × 13 × 113

Divisors: 1, 2, 7, 13, 14, 26, 91, 113, 182, 226

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: 101000001010110

Octal: 50126

Duodecimal: BA9A

Hexadecimal: 5056

Square: 422960356

Square Root: 143.40850741849314

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

Number of simple perfect squared squares of order n up to symmetry. A6983

Expansion of x⁹/((1-x)*(1-x²)*(1-x³))². A117485

a(n) = (2·n + 1)*(5·n + 1). A33571

Number of EE's crossing the line y = x (i.e., two consecutive E steps from the line y = x+1 to the line y = x-1) in all Delannoy paths of length n. A110127

a(n) = 686·n - 14. A157363

Expansion of ∏_k>=0 (1 + x^5·k+4)^5·k+4. A285340

a(n) is the number of 2 X 2 matrices with elements 1..n where at least one row and at least one column is strictly increasing. A390922

Heptagonal numbers for which the digital root is also a heptagonal number. A117663

Heptagonal numbers divisible by 7. A117795

A triangular array distributing the values of sequence A120380. A160645