Properties of the Number 20505

Twenty Thousand Five Hundred Five

Basics

Value: 20504 → 20505 → 20506

Parity: odd

Prime: No

Previous Prime: 20483

Next Prime: 20507

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 1367

Divisors: 1, 3, 5, 15, 1367, 4101, 6835, 20505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000000011001

Octal: 50031

Duodecimal: BA49

Hexadecimal: 5019

Square: 420455025

Square Root: 143.19567032560727

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

Difference between the number of odd parts and the number of even parts in all the partitions of n. A209423

Number of maximal collections of pairwise disjoint subsets {X,Y,Z} of {1, 2, ..., n}, each satisfying X + Y = Z. A2849

Number of maximal collections of pairwise disjoint subsets {X,Y,Z} of {1, 2, ..., n} with X + Y = Z (as in A002849), with the property that n is in one of the subsets. A2848

Number of partitions of {1,2,...,3n} into n triples (X,Y,Z) each satisfying X+Y=Z. A108235

Number of walks within N² (the first quadrant of Z²) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (1, 1)}. A151265

Number of different optimal triangle difference sets M(n,2). A234947

Odd binary Niven numbers (A144302) k such that k/wt(k) is also an odd binary Niven number, where wt(k) = A000120(k) is the binary weight of k. A376618

Base-9 palindromes that start with 3. A43030

Numbers k such that k and k² use only the digits 0, 2, 3, 4 and 5. A136882

Numbers k such that k and k² use only the digits 0, 2, 4 and 5. A136897