Properties of the Number 55820

Fifty-Five Thousand Eight Hundred Twenty

Basics

Value: 55819 → 55820 → 55821

Parity: even

Prime: No

Previous Prime: 55819

Next Prime: 55823

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 2791

Divisors: 1, 2, 4, 5, 10, 20, 2791, 5582, 11164, 13955

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1101101000001100

Octal: 155014

Duodecimal: 28378

Hexadecimal: da0c

Square: 3115872400

Square Root: 236.26256580338747

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

The number of edges formed on an isosceles triangle by straight line segments mutually connecting all vertices and all points that divide the two equal length sides into n equal parts; the base of the triangle contains no points other than its vertices. A333027

n² * a(n) = 2*(17·n²-21·n+9) * a(n-1) - 4*(112·n²-280·n+197) * a(n-2) + 40*(68·n²-256·n+251) * a(n-3) - 1600*(2·n-5)² * a(n-4), with a(0)=1, a(1)=10, a(2)=90, a(3)=780. A276020

a(n) = T(n,n-3), array T as in A055818. A55820