Properties of the Number -20686

Twenty Thousand Six Hundred Eighty-Six

Basics

Value: -20687 → -20686 → -20685

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 10343

Divisors: 1, 2, 10343, 20686

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101000011001110

Octal: -50316

Duodecimal: -BB7A

Hexadecimal: -50ce

Square: 427910596

Square Root: 143.82628410690447

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

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302322

Number of integer partitions of n that are neither Look-and-Say nor section-sum. A383510

G.f.: exp( ∑_n>=1 A068963(n)*xⁿ/n ) where A068963(n) = ∑_d∣n φ(d³). A226106

Length of n-th iterate of the mapping 00->0010, 01->001, 10->001, starting with 00. A289000

Total number of occurrences of 6 in the (signed) displacement sets of all permutations of [n+6] divided by 6!. A324356

The internal state of the Sinclair ZX81 and Spectrum random number generator. A357907

Length of n-th iterate of the mapping 00->0010, 10->010, 1-->001, starting with 00. A289028

a(n) is the Wiener index of a tridon on n vertices. A349418

Number of nX5 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302319

Number of 5Xn 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302326