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Properties of the Number 20786

Twenty Thousand Seven Hundred Eighty-Six

Basics

Value: 20785 → 20786 → 20787

Parity: even

Prime: No

Previous Prime: 20773

Next Prime: 20789

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 19 × 547

Divisors: 1, 2, 19, 38, 547, 1094, 10393, 20786

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101000100110010

Octal: 50462

Duodecimal: 10042

Hexadecimal: 5132

Square: 432057796

Square Root: 144.1735065814798

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 indecomposable self-dual binary codes of length 2n. A3178
Numbers k that, when expressed in base 4 and then interpreted in base 9, give a multiple of k. A62925
Number of balanced reduced multisystems whose atoms cover an initial interval of positive integers with multiplicities equal to the prime indices of n. A318846
Maximal length of rook tour on an n X n+1 board. A152132
Number of dissections of an n-gon by nonintersecting diagonals into polygons with a prime number of sides counted up to rotations. A295495
Maximal length of rook tour on an n X n+3 board. A152134
Convolution of odd numbers and primes. A23662
Number of indecomposable Type I but not Type II binary self-dual codes of length 2n. A106164
For a lesser p=A001359(n-1), n>=2, of twin primes, let Bk be the sequence defined as A159559 but with initial term k; a(n) is the smallest m such that Bp+2(m)-Bp(m) = maxt>=2 (Bp+2(t)-Bp(t)). A276831
Numbers k such that 2·10k + 7·Rk - 6 is prime, where Rk = 11...1 is the repunit (A002275) of length k. A98960