Properties of the Number 20069

Twenty Thousand Sixty-Nine

Basics

Value: 20068 → 20069 → 20070

Parity: odd

Prime: No

Previous Prime: 20063

Next Prime: 20071

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 7 × 47 × 61

Divisors: 1, 7, 47, 61, 329, 427, 2867, 20069

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111001100101

Octal: 47145

Duodecimal: B745

Hexadecimal: 4e65

Square: 402764761

Square Root: 141.66509803053114

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

Numbers m such that Stern polynomial B(m,x) has no irreducible polynomial factors that themselves are Stern polynomials. The initial a(1) = 1 is included by convention. A389918

a(n) = 1 + 2·least i such that A103509(i)=n+1, 0 if no such i exists. A103510

Seventh diagonal (m=6) of triangle A084938; a(n) = A084938(n+6,n) = (n⁶ + 45·n⁵ + 925·n⁴ + 11475·n³ + 92314·n² + 413640·n)/720. A90392

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 411", based on the 5-celled von Neumann neighborhood. A271891

Absolute differences between A109441 and A100948. A120722

Numbers k such that (14·10^k + 211)/9 is prime. A294941

Integer part of γ(n+1/9)/γ(1/9). A20069

a(n) is the number of ordered solutions (x,y,z) to x² + y² == z² mod n with 1 <= x,y,z <= n-1. A136679