Properties of the Number 20819

Twenty Thousand Eight Hundred Nineteen

Basics

Value: 20818 → 20819 → 20820

Parity: odd

Prime: No

Previous Prime: 20809

Next Prime: 20849

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 109 × 191

Divisors: 1, 109, 191, 20819

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000101010011

Octal: 50523

Duodecimal: 1006B

Hexadecimal: 5153

Square: 433430761

Square Root: 144.28790663115188

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

G.f.: ∏_k>=1 (1+x^k²) / (1-x^k). A280204

Anagrasum integers: integers N that exactly reproduce their set of digits when we form the set of sums of pairs of adjacent digits. A296521

Expansion of ∏_k>0 (1 + ∑_m>0 x^k·m!). A304332

Numbers k such that 10^k*(10⁷*(-1+10^k)+6083806) + 10^k - 1 is prime. A107291

Exponents k such that exp(k)/π is closer to an integer than for any smaller k. A387495

Decimal expansion of 1/sqrt(62). A20819