Properties of the Number 20646

Twenty Thousand Six Hundred Forty-Six

Basics

Value: 20645 → 20646 → 20647

Parity: even

Prime: No

Previous Prime: 20641

Next Prime: 20663

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 31 × 37

Divisors: 1, 2, 3, 6, 9, 18, 31, 37, 62, 74

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010100110

Octal: 50246

Duodecimal: BB46

Hexadecimal: 50a6

Square: 426257316

Square Root: 143.68716017793656

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 T(n,k) read by rows, giving number of bracelets (turnover necklaces) with n beads of k colors (n >= 1, 1 <= k <= n). A81720

Number of bracelets of length n using a maximum of six different colored beads. A56341

Number of ways to color vertices of a heptagon using <= n colors, allowing rotations and reflections. A60532

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

First row of infinite array A(j,k): A(j,1) = j-1; A(1,k) = A(2,k-1); for j, k > 1, A(j,k) = A(j-1,k) - A(j+1,k-1) if that number is positive and not already in column k, A(j,k) = A(j-1,k) + A(j+1,k-1) otherwise. A140985

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MOR = Mordenite Na8[Al8Si40O96].24H2O starting with a T4 atom. A19182

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite NON = Nonasil-[ 4158 ] [Si88O176].4R starting with a T3 atom. A19213

Number of n X 3 1..3 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order. A166782

G.f. for Ehrhart quasi-polynomials for hyperplane arrangements of type E₈. A210632

Table T(n,k) read by antidiagonals: number of necklaces allowing turnovers (bracelets) with n beads of k colors. A51137