Properties of the Number 20218

Twenty Thousand Two Hundred Eighteen

Basics

Value: 20217 → 20218 → 20219

Parity: even

Prime: No

Previous Prime: 20201

Next Prime: 20219

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 11 × 919

Divisors: 1, 2, 11, 22, 919, 1838, 10109, 20218

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111011111010

Octal: 47372

Duodecimal: B84A

Hexadecimal: 4efa

Square: 408767524

Square Root: 142.1900137140439

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

Triangle read by rows: T(n,k) is the number of permutations of [n] with exactly k increasing runs of even length. A97592

Number of permutations of [n] with no increasing runs of even length. A97597

Number of regions in the hyperoctahedral (or cocktail party) graph of order n. A368755

a(n+1) = a(n) + floor(a(n)/4) with a(0)=4. A182305

Number of points on surface of truncated tetrahedron: a(n) = 14·n² + 2 for n > 0, a(0)=1. A5905

Difference between A007678(2n)/(2n) and (n-1)². A85611

Primes of the form p·q + p + q, where p and q are two successive primes. A96342

Pseudoprimes to base 90. A20218