Properties of the Number 20520

Twenty Thousand Five Hundred Twenty

Basics

Value: 20519 → 20520 → 20521

Parity: even

Prime: No

Previous Prime: 20509

Next Prime: 20521

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ³ × 5 × 19

Divisors: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000000101000

Octal: 50050

Duodecimal: BA60

Hexadecimal: 5028

Square: 421070400

Square Root: 143.24803663575986

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

4-dimensional figurate numbers: a(n) = n·binomial(n+2, 3). A2417

Expansion of (1-x)^-3 * (1-x²)^-2. A2624

When expressed in base 2 and then interpreted in base 3, is a multiple of the original number. A62845

Sum of divisors of 2ⁿ+1. A69061

Alkane (or paraffin) numbers l(7,n). A5994

Sum of the divisors of 4ⁿ+1. A366607

Even 10-gonal (or decagonal) numbers. A28994

Sum of distinct terms of A002674: a(0) = 0, a(2n) = A255411(A153880(a(n))), a(2n+1) = 1+A255411(A153880(a(n))). A275959

Coefficients in expansion of 1/E₄^1/2. A289566

Dirichlet g.f.: ∏_k>=2 1 / (1 - k^-s)^k³. A343283