Properties of the Number 20662

Twenty Thousand Six Hundred Sixty-Two

Basics

Value: 20661 → 20662 → 20663

Parity: even

Prime: No

Previous Prime: 20641

Next Prime: 20663

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 10331

Divisors: 1, 2, 10331, 20662

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000010110110

Octal: 50266

Duodecimal: BB5A

Hexadecimal: 50b6

Square: 426918244

Square Root: 143.7428259079388

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

a(n) = a(n-2) + a(n-3) + a(n-4) + a(n-5) + a(n-6) + a(n-7). A107479

a(n) = ∑_i=1..n ∑_j=1..i (prime(i) - prime(j)). A62020

T(n,k)=Number of nXk binary arrays without the pattern 0 1 0 diagonally, vertically, antidiagonally or horizontally. A188695

Expansion of 1/(1-x²-x³-x⁴-x⁵-x⁶-x⁷). A13984

Numbers k such that k! + (k+1)! - 1 is prime. A87146

Number of nX4 binary arrays without the pattern 0 1 0 diagonally, vertically, antidiagonally or horizontally. A188690

Number of nX5 binary arrays without the pattern 0 1 0 diagonally, vertically, antidiagonally or horizontally. A188691

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 94", based on the 5-celled von Neumann neighborhood. A270135

Numerator of the average distance among first n primes. A332094

Lexicographically earliest increasing sequence of positive numbers that contains no arithmetic progression of length 9. A20662