Properties of the Number 20744

Twenty Thousand Seven Hundred Forty-Four

Basics

Value: 20743 → 20744 → 20745

Parity: even

Prime: No

Previous Prime: 20743

Next Prime: 20747

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 2593

Divisors: 1, 2, 4, 8, 2593, 5186, 10372, 20744

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000100001000

Octal: 50410

Duodecimal: 10008

Hexadecimal: 5108

Square: 430313536

Square Root: 144.02777509911067

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

T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors. A283415

Number of permutations according to distance. A2525

Numerators of continued fraction convergents to sqrt(19). A41028

Number of triple-crossings of diagonals in the regular 2n-gon. A260417

Numbers n such that p1=2n+3, p2=4n+5, p3=6n+7 and p4=8n+9 are all prime. A105653

a(n) = 64·n² + 8. A158488

Numbers m for which p(m, 2)*p(m, 5) = p(m, 10), where p(m, b) is the period of repeating digits of 1/m in base b. A334488

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 36. A31714

Row sums of A102416. A103179

Number of n X 3 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors. A283410