Properties of the Number 20205

Twenty Thousand Two Hundred Five

Basics

Value: 20204 → 20205 → 20206

Parity: odd

Prime: No

Previous Prime: 20201

Next Prime: 20219

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 449

Divisors: 1, 3, 5, 9, 15, 45, 449, 1347, 2245, 4041

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111011101101

Octal: 47355

Duodecimal: B839

Hexadecimal: 4eed

Square: 408242025

Square Root: 142.1442928857856

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

Sum of 12 positive 9th powers. A4801

Number of multigraphs with loops on 3 nodes with n edges. A50531

T(n,k)=half the number of nXk binary arrays with each element equal to at least two neighbors. A180760

One of the two successive approximations up to 7ⁿ for the 7-adic integer sqrt(-5). These are the numbers congruent to 3 mod 7 (except for the initial 0). A290806

Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295014

Rounded volume of a regular icosahedron with edge length n. A71402

Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero. A298051

Numbers k such that k and k² use only the digits 0, 2, 4, 5 and 8. A136900

Half the number of nX6 binary arrays with each element equal to at least two neighbors. A180755

Half the number of nX7 binary arrays with each element equal to at least two neighbors. A180756