Properties of the Number 20628

Twenty Thousand Six Hundred Twenty-Eight

Basics

Value: 20627 → 20628 → 20629

Parity: even

Prime: No

Previous Prime: 20627

Next Prime: 20639

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ³ × 191

Divisors: 1, 2, 3, 4, 6, 9, 12, 18, 27, 36

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000010010100

Octal: 50224

Duodecimal: BB30

Hexadecimal: 5094

Square: 425514384

Square Root: 143.6245104430299

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 partitions of n in which no parts are multiples of 3. A726

Starts of runs of 3 consecutive Zeckendorf-Niven numbers (A328208). A328210

Number of lines through at least 2 points of a 10 X n grid of points. A160850

Numbers missing from A001033 despite satisfying the necessary congruence conditions (see comments). A274470

Number of permutations of 1..n with the ∑_i=1..n of (i-p(i))² <= (n-1)*n*(n+1)/6. A180111

a(n) = 3·n*(n² + 3·n + 4). A280304

Triangle read by rows: T(n,k) is k-th entry of the toric g-vector of the n-dimensional associahedron, 0 <= k <= floor(n/2). A390883

Numbers k such that (74·10^k + 133)/9 is prime. A293276

Triangle read by rows. Number of perfect matchings by number of connected components. A362308

Smallest nonempty set S containing prime divisors of 9k+6 for each k in S. A20628