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Properties of the Number 20682

Twenty Thousand Six Hundred Eighty-Two

Basics

Value: 20681 → 20682 → 20683

Parity: even

Prime: No

Previous Prime: 20681

Next Prime: 20693

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 3 × 383

Divisors: 1, 2, 3, 6, 9, 18, 27, 54, 383, 766

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101000011001010

Octal: 50312

Duodecimal: BB76

Hexadecimal: 50ca

Square: 427745124

Square Root: 143.8123777704826

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,t) by rows: The number of rooted forests with n 3-colored nodes and t rooted trees. A271879
Number of independent generators of degree n of the algebra of Free quasi-symmetric functions (or Malvenuto-Reutenauer algebra of permutations) as a dendriform dialgebra (i.e., number of totally primitive elements). A122827
Triangle T(n,k) = A000142(n-k)*A003319(k+1) read by rows. A141476
Number of regions in a polygon whose boundary consists of n+2 equally spaced points around the arc of a semicircle. See Comments for precise definition. A333643
Number of series-reduced dyslexic planted compound windmills with n leaves of 2 colors where any 2 submills extending from the same node are different. A32238
Irregular table read by rows: Take a concave circular triangle with all diagonals drawn, as in A340685. Then T(n,k) = number of k-sided polygons in that figure for k >= 3. A340688
Numbers of form 4 x2 + 5 y2. A20682
Zeroless numbers k such that x2 - s·x + p has only integer roots, where s and p denote the sum and product of the digits of k respectively. A355608
Taxicab numbers that are sandwiched between nonsquarefree numbers. A372296