Properties of the Number 20466

Twenty Thousand Four Hundred Sixty-Six

Basics

Value: 20465 → 20466 → 20467

Parity: even

Prime: No

Previous Prime: 20443

Next Prime: 20477

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ³ × 379

Divisors: 1, 2, 3, 6, 9, 18, 27, 54, 379, 758

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111111110010

Octal: 47762

Duodecimal: BA16

Hexadecimal: 4ff2

Square: 418857156

Square Root: 143.05942821079637

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

Carlitz-Riordan q-Catalan numbers (recurrence version) for q=5. A15086

Triangle read by rows: T(n,k) (n>=0, 0<=k<=A002620(n-1)) is the number of permutations of [n] with k nestings. A263776

Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of continued fraction 1/(1 - x/(1 - k·x/(1 - k²*x/(1 - k³*x/(1 - k⁴*x/(1 - ...)))))). A290759

Triangle T(n,k), 0 <= k <= n, composed of k-Catalan numbers. A90182

Number of permutations of length n with exactly 8 occurrences of the pattern 2-13. A120816

A007318 * [1, 2, 2, 3, 2, 3, 2, 3, 2, ...]. A133124

Expansion of (1 - x - 6·x²)/(1 - x - 8·x²). A100304

Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of regions in that figure. A337700

Positive numbers k such that k and 3·k are anagrams in base 7 (written in base 7). A23069

Expansion of 1 / (1 - ∑_{i>=1, j>=1} x^{i·j*(j + 1}/2)). A327764