Properties of the Number 20890

Twenty Thousand Eight Hundred Ninety

Basics

Value: 20889 → 20890 → 20891

Parity: even

Prime: No

Previous Prime: 20887

Next Prime: 20897

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 × 2089

Divisors: 1, 2, 5, 10, 2089, 4178, 10445, 20890

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000110011010

Octal: 50632

Duodecimal: 1010A

Hexadecimal: 519a

Square: 436392100

Square Root: 144.53373308677806

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 6-cycles in the n X n king graph. A288920

Conjectured dimensions of spaces of weight systems of chord diagrams. A14595

Indices of primes in sequence defined by A(0) = 79, A(k) = 10·A(k-1) - 81 for k > 0. A101130

Expansion of g.f. x*(1 - x)*(1 + x)/((x² + 3·x + 1)*(x² - 4·x + 1)). A171067

Numbers n such that prime(n) contains a substring of all the prime digits in order, i.e., "2357". A295708

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MEP = Melanophlogite [Si46O92].qR starting with a T2 atom. A19156

Numbers whose base-12 representation has exactly 5 runs. A43654

Ordered set of (b + c - a)/2 as (a,b,c) runs through all primitive Pythagorean triples with a < b < c. A20890

The hyper-Wiener index of the nanostar dendrimer D₁[n], defined pictorially in the Eslahchi et al. reference. A221051