Properties of the Number 13820

Thirteen Thousand Eight Hundred Twenty

Basics

Value: 13819 → 13820 → 13821

Parity: even

Prime: No

Previous Prime: 13807

Next Prime: 13829

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 691

Divisors: 1, 2, 4, 5, 10, 20, 691, 1382, 2764, 3455

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010111111100

Octal: 32774

Duodecimal: 7BB8

Hexadecimal: 35fc

Square: 190992400

Square Root: 117.55849607748476

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

Meandric numbers: number of ways a river can cross a road n times. A5316

Closed meandric numbers (or meanders): number of ways a loop can cross a road 2n times. A5315

a(n) = ∑_k=0..n C(n+k,n-k)*C(2·n-k,k). A183160

Numbers k such that 10^k - 3 is prime. A89675

Number of unimodal maps [1..n]->[0..3]. A223659

Expansion of (2/(3·sqrt(1-4·z)-1+4·z))*((1-sqrt(1-4·z))/(2·z))^k with k=6. A172063

Triangle read by rows: T(n,k) = number of closed meander systems of order n with k<=n components. A8828

Numbers k that divide the sum of digits of 13^k. A175525

a(n) = ∑_k=0..7 (n + k)². A276026

Maximal length of rook tour on an n X n+1 board. A152132