Properties of the Number 20381

Twenty Thousand Three Hundred Eighty-One

Basics

Value: 20380 → 20381 → 20382

Parity: odd

Prime: No

Previous Prime: 20369

Next Prime: 20389

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 89 × 229

Divisors: 1, 89, 229, 20381

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111110011101

Octal: 47635

Duodecimal: B965

Hexadecimal: 4f9d

Square: 415385161

Square Root: 142.76203977248295

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

Difference between the sum of next prime(n) natural numbers and the sum of next n primes. A82749

Sum of all terms on the two principal diagonals of a 2n+1 X 2n+1 square spiral. A114254

The sum of the principal diagonals of an n X n spiral. A137930

a(n) = ∑_i=0..n digsum₇(i)⁴, where digsum₇(i) = A053828(i). A231679

Number of partitions p of n such that max(p) - min(p) = 10. A218573

Numbers k such that both k and k+2 are de Polignac numbers (A006285). A330284

Number of Hamiltonian cycles in a tournament on 3n vertices constructed by taking 3 copies of a transitive tournament on n vertices and placing each copy on a vertex of a directed 3-cycle, with all edges between the copies oriented in the direction of the cycle. A256286

Numbers k such that the continued fraction for sqrt(k) has period 42. A20381