Properties of the Number 20667

Twenty Thousand Six Hundred Sixty-Seven

Basics

Value: 20666 → 20667 → 20668

Parity: odd

Prime: No

Previous Prime: 20663

Next Prime: 20681

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 83 ²

Divisors: 1, 3, 83, 249, 6889, 20667

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000010111011

Octal: 50273

Duodecimal: BB63

Hexadecimal: 50bb

Square: 427124889

Square Root: 143.76021702821683

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 unrooted triangulations of a quadrilateral with n internal nodes. A5500

Array T(n,k) read by antidiagonals: T(n,k) is the number of [n,k]-triangulations in the plane, n >= 0, k >= 0. A169808

Numbers p²*q, p > q odd primes such that q divides p+1. A350245

3p² where p runs through the primes. A79705

Triangle read by rows: T(n,k) is the number of n-node connected unsensed planar maps with an external face and k triangular internal faces, n >= 3, 1 <= k <= 2·n - 5. A378103

Odd numbers k such that A166100((k-1)/2)/k is not an integer. A166102

3·h², where h is an odd integer not divisible by 3. A229852

G.f. A(x) satisfies A(x/A(x)) = sqrt( A(x)/(1-x) ). A383373

Composite numbers whose prime factors contain no digits other than 3 and 8. A36317

Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 3,1. A37588