Properties of the Number 20423

Twenty Thousand Four Hundred Twenty-Three

Basics

Value: 20422 → 20423 → 20424

Parity: odd

Prime: No

Previous Prime: 20411

Next Prime: 20431

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 13 × 1571

Divisors: 1, 13, 1571, 20423

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111111000111

Octal: 47707

Duodecimal: B99B

Hexadecimal: 4fc7

Square: 417098929

Square Root: 142.90906199398273

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(n) = prime(n)*prime(n+1) - prime(n) - prime(n+1). A37165

Number of n X 2 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero. A297852

Numbers k such that 11k = 6j² + 6j + 1. A106388

Expansion of f(-x⁶)³ / (f(-x⁴)² * ψ(x)) in powers of·where φ(), f() are Ramanujan θ functions. A262152

a(n+1)³ is next smallest nontrivial cube beginning with a(n)³, initial cube is 8. A48566

a(n) = 121·n² - 2·n. A157040

Numbers of the form ∏_k=i..j prime(k) - ∑_k=i..j prime(k) where i < j. A387946

Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. A155347

T(n,k) is the number of 0..k arrays x(0..n+1) of n+2 elements without any interior element greater than both neighbors. A200886

T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero. A297858