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Properties of the Number 1820

One Thousand Eight Hundred Twenty

Basics

Value: 1819 → 1820 → 1821

Parity: even

Prime: No

Previous Prime: 1811

Next Prime: 1823

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 2 × 5 × 7 × 13

Divisors: 1, 2, 4, 5, 7, 10, 13, 14, 20, 26

Polygonal

Triangular: No

Square: No

Pentagonal: Yes

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Representations

Binary: 11100011100

Octal: 3434

Duodecimal: 1078

Hexadecimal: 71c

Square: 3312400

Square Root: 42.661458015403085

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