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Properties of the Number 6820

Six Thousand Eight Hundred Twenty

Basics

Value: 6819 → 6820 → 6821

Parity: even

Prime: No

Previous Prime: 6803

Next Prime: 6823

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 2 × 5 × 11 × 31

Divisors: 1, 2, 4, 5, 10, 11, 20, 22, 31, 44

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1101010100100

Octal: 15244

Duodecimal: 3B44

Hexadecimal: 1aa4

Square: 46512400

Square Root: 82.58329128825031

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

Number of regions in regular n-gon with all diagonals drawn. A7678
Numbers that are the sum of 8 positive 7th powers. A3375
Numbers that are the sum of 5 nonzero 8th powers. A3383
Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m·k + 1)*T(n-1, k, m) - m·f(n,k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1, f(n, k) = k if k <= floor(n/2) otherwise n-k, and m = 3, read by rows. A157212
For 0 <= R <= 255, let s(R,n) = eventual period of a single cell in a Rule R cellular automaton operating in a cyclic universe of width n; a(n) = maxR s(R,n). A334499
a(n) = floor(n*φ15), where φ is the golden ratio, A001622. A4930
Eventual period of a single cell in rule 75 cellular automaton in a cyclic universe of width n. A334515
Array read by antidiagonals: T(n,m) = number of directed Hamiltonian walks from NW to SW corners on a grid with n rows and m columns. A271592
Numbers having exactly three prime gaps in their factorization. A73495
T(n,k)=Number of length n+2 0..k arrays with the sum of the maximum minus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero. A252177