Properties of the Number 20079

Twenty Thousand Seventy-Nine

Basics

Value: 20078 → 20079 → 20080

Parity: odd

Prime: No

Previous Prime: 20071

Next Prime: 20089

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 23 × 97

Divisors: 1, 3, 9, 23, 69, 97, 207, 291, 873, 2231

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111001101111

Octal: 47157

Duodecimal: B753

Hexadecimal: 4e6f

Square: 403166241

Square Root: 141.70038814343454

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

Integers that are Rhonda numbers to base 15. A100974

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors. A186482

a(n) = ∑_k=0..[n/2] C(n-k,k)² * n/(n-k), n>=1. A167539

a(n) = n-th Rhonda number to base b = n-th composite number, cf. A002808. A255880

T(n,m)=Number of (n+1)X2 0..m arrays with every 2X2 subblock commuting with each of its vertical 2X2 subblock neighbors. A187363

a(0)=1, a(n) = least k > a(n-1) such that k·a(n-1) is a triangular number. A213005

Number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors. A186474

Number of 3-colored integer partitions such that no adjacent parts have the same color. A262444

Indices of records in A365260. A366060

a(n) = a(n-1) XOR ∑_k=1..n-1 a(k), with a(1)=1, a(2)=3, where XOR is the binary exclusive OR operation. A99811