Properties of the Number 20660

Twenty Thousand Six Hundred Sixty

Basics

Value: 20659 → 20660 → 20661

Parity: even

Prime: No

Previous Prime: 20641

Next Prime: 20663

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 1033

Divisors: 1, 2, 4, 5, 10, 20, 1033, 2066, 4132, 5165

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000010110100

Octal: 50264

Duodecimal: BB58

Hexadecimal: 50b4

Square: 426835600

Square Root: 143.7358688706476

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 n X 3 binary matrices under row and column permutations and column complementations. A6381

Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5. A116130

Numbers k such that k concatenated with k+2 gives the product of two numbers which differ by 1. A116170

a(n) = floor(a(n-1)/2) + a(n-2) with a(0)=1, a(1)=2. A64650

Polynomial extrapolation of 2, 3, 5, 7, 11. A61165

Numerator of Hermite(n, 5/19). A159622

Number of partitions with at most one part divisible by 5. A39905

Numbers n such that 117·2ⁿ-1 is prime. A50584

Number of 0..5 arrays x(0..n) of n+1 elements with zero n-1st differences. A200079

Lexicographically earliest increasing sequence of positive numbers that contains no arithmetic progression of length 8. A20660