Properties of the Number 20666

Twenty Thousand Six Hundred Sixty-Six

Basics

Value: 20665 → 20666 → 20667

Parity: even

Prime: No

Previous Prime: 20663

Next Prime: 20681

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 10333

Divisors: 1, 2, 10333, 20666

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101000010111010

Octal: 50272

Duodecimal: BB62

Hexadecimal: 50ba

Square: 427083556

Square Root: 143.75673897247393

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 set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= five. A287255

Number of integer partitions of n with non-biquanimous multiplicities. A371840

Convolution of Fibonacci numbers (A000045) and partition numbers (A000041). A275388

Numbers k such that the continued fraction for sqrt(k) has period 59. A20398

Numbers k such that 79·2^k+1 is prime. A32389

Number of planar n X n X n binary triangular grids with no more than 2 ones in any 4 X 4 X 4 subtriangle. A153527

Numbers n such that 10ⁿ - 99 is prime. A178439

Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1. A296025

a(n)ⁿ is the least n-th power containing every digit. A20666

Number of nX6 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302633