Properties of the Number 20854

Twenty Thousand Eight Hundred Fifty-Four

Basics

Value: 20853 → 20854 → 20855

Parity: even

Prime: No

Previous Prime: 20849

Next Prime: 20857

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 10427

Divisors: 1, 2, 10427, 20854

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000101110110

Octal: 50566

Duodecimal: 1009A

Hexadecimal: 5176

Square: 434889316

Square Root: 144.40914098491135

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

Maximal number of regions obtained by joining n points around a circle by straight lines. Also number of regions in 4-space formed by n-1 hyperplanes. A127

Distance from 2ⁿ to the nearest triangular number. A233327

Difference between 4ⁿ and the nearest triangular number. A238455

Solution of the complementary equation a(n) = 2·a(n-2) - b(n-1) + n, where a(0) = 4, a(1) = 5, b(0) = 1, and (a(n)) and (b(n)) are increasing complementary sequences. A295068

Let R(i,j) be the rectangle with antidiagonals 1; 2,3; 4,5,6; ...; each k is an R(i(k),j(k)) and A057046(n)=i(2ⁿ). A57046

Number of increasing sequences of n integers x(1),...,x(n) with values in 1..3·n such that x(j) divides x(k) if j divides k. A180385

Numbers k such that (56·10^k + 403)/9 is prime. A294483

Decimal expansion of 1/sqrt(97). A20854