Properties of the Number 20654

Twenty Thousand Six Hundred Fifty-Four

Basics

Value: 20653 → 20654 → 20655

Parity: even

Prime: No

Previous Prime: 20641

Next Prime: 20663

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 23 × 449

Divisors: 1, 2, 23, 46, 449, 898, 10327, 20654

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000010101110

Octal: 50256

Duodecimal: BB52

Hexadecimal: 50ae

Square: 426587716

Square Root: 143.71499573809268

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

Sum of the sixth largest parts of the partitions of n into 9 parts. A326468

Number of self-avoiding walks of length n from origin in strip Z X {0,1}. A38577

Number of strict partitions of 2n having 1 more even part than odd, so that there is at least one ordering of the parts in which the even and odd parts alternate, and the first and last terms are even. A239872

a(n) = floor( e^(n/2*arccosh(1+sqrt(2))) ). A93698

a(n) = if n mod 2 = 0 then 8·F(n)-n otherwise 8·F(n)-4, where F() = Fibonacci numbers A000045. A110935

Numbers n such that σ(n) and σ(σ(n)) are both perfect squares. A134263

Lexicographically earliest infinite increasing sequence of nonnegative numbers containing no 5-term arithmetic progression. A20654

Number of steps for n to stop, according to the "multiply with zero" rules explained in A365994. A365260

Total number of inversions in all permutations of order n consisting of a single cycle. A227404

Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks and between consecutive elements within the blocks are not larger than five. A287584