Properties of the Number 20765

Twenty Thousand Seven Hundred Sixty-Five

Basics

Value: 20764 → 20765 → 20766

Parity: odd

Prime: No

Previous Prime: 20759

Next Prime: 20771

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 4153

Divisors: 1, 5, 4153, 20765

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000100011101

Octal: 50435

Duodecimal: 10025

Hexadecimal: 511d

Square: 431185225

Square Root: 144.10065926289164

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

a(1) = 3; a(n+1) = a(n)-th composite. A22451

Number of 2-distant 3-noncrossing partitions of {1,...,n}. A366774

Numbers k such that the continued fraction for sqrt(k) has period 35. A20374

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFS = ZSM-57 H1.5[Al1.5Si34.5O72] starting with a T5 atom. A19173

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 11. A51976

Numbers k such that k![4] - 4 is prime, where k![4] = A007662(k) = quadruple factorial. A328454

Decimal expansion of 1/sqrt(8). A20765