Properties of the Number 20548

Twenty Thousand Five Hundred Forty-Eight

Basics

Value: 20547 → 20548 → 20549

Parity: even

Prime: No

Previous Prime: 20543

Next Prime: 20549

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 11 × 467

Divisors: 1, 2, 4, 11, 22, 44, 467, 934, 1868, 5137

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000001000100

Octal: 50104

Duodecimal: BA84

Hexadecimal: 5044

Square: 422220304

Square Root: 143.34573589751457

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 pentagonal regions in regular n-gon with all diagonals drawn. A67152

Expansion of ∏_k>=1 (1 - x^k)¹¹. A10819

E.g.f.: exp(-1)*∑_n>=0 (1+x)^n³/n!. A211250

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

Coordination sequence for σ-CrFe, Position Xc. A9961

Numbers whose base-4 representation contains exactly four 0's and four 1's. A45037

a(n) = A000695(A014486(n)). A83931

Largest number that is not the sum of five n-gonal numbers. A118367

A106486-encodings of combinatorial games with value 2. A125995

Number of increasing sequences of n integers x(1),...,x(n) with values in 1..3·n such that x(j) divides x(k) if j divides k. A180385