Properties of the Number 69020

Sixty-Nine Thousand Twenty

Basics

Value: 69019 → 69020 → 69021

Parity: even

Prime: No

Previous Prime: 69019

Next Prime: 69029

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 7 × 17 × 29

Divisors: 1, 2, 4, 5, 7, 10, 14, 17, 20, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000110110011100

Octal: 206634

Duodecimal: 33B38

Hexadecimal: 10d9c

Square: 4763760400

Square Root: 262.7165773224065

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(0) = 1; a(n) = ∑_{k=0..floor((n-1)/2)} binomial(n-1,2·k) * a(k). A352044

Number of ways to place 2 queens on an n X n chessboard so that they attack each other. A144945

a(n) = n*(n + 1)*(3·n + 1). A27903

a(n) = ∑_k=1..n k*(prime(k) - k). A110477

Numbers n such that 69·2ⁿ-1 is prime. A50560

Govindarajan's triangle β arising in enumeration of multi-dimensional partitions, read by rows. A216808

T(n,k)=Number of strings of numbers x(i=1..n) in 0..k with sum i³*x(i)² equal to n³*k². A184303

a(1) = 1; a(n) = smallest number of the form k·a(n-1) +1 divisible by n². A69020