Properties of the Number 20555

Twenty Thousand Five Hundred Fifty-Five

Basics

Value: 20554 → 20555 → 20556

Parity: odd

Prime: No

Previous Prime: 20551

Next Prime: 20563

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 4111

Divisors: 1, 5, 4111, 20555

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000001001011

Octal: 50113

Duodecimal: BA8B

Hexadecimal: 504b

Square: 422508025

Square Root: 143.3701503103069

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. A(x) satisfies A(x)² = A(x²) + 2·A(x³). A377255

Number of binary words of length n with exactly 7 (possibly overlapping) occurrences of the subword given by the binary expansion of n. A236236

Number of partitions n such that the multiplicity of the number of even parts is a part. A240540

Number of identity trees with n nodes where the maximal outdegree (branching factor) equals 5. A245750

Index of the first occurrence of A019565(2n-1) in sequence A103790. A103791

Difference between the n-th partial sum of the squares (A000330) and the n-th partial sum of the primes (A007504). A108753

Numbers k such that k and k² use only the digits 0, 2, 4, 5 and 8. A136900

Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits. A261142

Number of multigraphs on n labeled edges (with loops). Also number of genetically distinct states amongst n individuals. A20555

Irregular triangle read by rows: T(n,k) is the number of identity trees with n nodes and maximal branching factor k. A244523