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Properties of the Number 20187

Twenty Thousand One Hundred Eighty-Seven

Basics

Value: 20186 → 20187 → 20188

Parity: odd

Prime: No

Previous Prime: 20183

Next Prime: 20201

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 2 × 2243

Divisors: 1, 3, 9, 2243, 6729, 20187

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100111011011011

Octal: 47333

Duodecimal: B823

Hexadecimal: 4edb

Square: 407514969

Square Root: 142.08096283457542

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

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7. A252433
Exponents k where A000120(3k) - A070939(3k)/2 reaches a new maximum. A372099
Denominators of continued fraction convergents to sqrt(374). A41709
A014486-indices of A083932-trees. A83934
Numbers k such that the first 9 digits of the k-th Lucas number are 1-9 pandigital. A216489
Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7. A252429
Number of (5+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7. A252438
Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 782", based on the 5-celled von Neumann neighborhood. A273536
Sum of the third largest parts in the partitions of n into 6 parts. A308871
Primes of the form p·q - p - q, where p and q are two successive primes. A96345