Properties of the Number 20001

Twenty Thousand One

Basics

Value: 20000 → 20001 → 20002

Parity: odd

Prime: No

Previous Prime: 19997

Next Prime: 20011

Digit Sum: 3

Digital Root: 3

Palindrome: No

Factorization: 3 × 59 × 113

Divisors: 1, 3, 59, 113, 177, 339, 6667, 20001

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100111000100001

Octal: 47041

Duodecimal: B6A9

Hexadecimal: 4e21

Square: 400040001

Square Root: 141.42489172702236

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

Numbers whose sum of digits is 3. A52217

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7. A252305

Numbers k such that the average digit of k² is 1. A164771

a(n) = 2·10ⁿ + 1. A199682

Lexicographically earliest sequence of distinct positive terms such that a(n) is a substring of a(n)*a(n+1). A332703

Ternary numbers that are concatenated runs C(1)B(1)A(1)C(2)B(2)A(2)...C(k)B(k)A(k), where A(i) is a run of 1's, B(i) a run of 0's, and C(i) a run of 2's, for i = 1..k. A371109

Primes in ternary. A1363

A239461(n) / n². A239464

Automorphic numbers: numbers k such that k⁶ ends with k. Also m-morphic numbers for all m not congruent to 26 (mod 50) but congruent to 6 (mod 10). A68408

Primes of form 4k+3 written in base 3. A72805