Properties of the Number 20210

Twenty Thousand Two Hundred Ten

Basics

Value: 20209 → 20210 → 20211

Parity: even

Prime: No

Previous Prime: 20201

Next Prime: 20219

Digit Sum: 5

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 43 × 47

Divisors: 1, 2, 5, 10, 43, 47, 86, 94, 215, 235

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111011110010

Octal: 47362

Duodecimal: B842

Hexadecimal: 4ef2

Square: 408444100

Square Root: 142.16187955988764

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

Łukasiewicz word for each rooted plane tree (interpretation e in Stanley's exercise 19) encoded by A014486 (or A063171), with the last leaf implicit, i.e., these words are given without the last trailing zero, except for the null tree which is encoded as 0. A71153

Number of partitions p of n not including round(mean(p)) as a part. (This is "Mathematica round"; for round(x) defined as floor(x + 1/2), see A241734.) A241339

5-Smith numbers. A103126

Number of partitions p of n such that round(mean(p)) is not a part of p; here, round(x) means floor(x + 1/2). A241734

In the list of divisors of n (in base 3), each digit 0-2 appears equally often. A45811

Numbers k such that N·2^k - 1 is prime where N = 9999999999999999999999988888888888888888887777777777777777766666666666665555555555544444443333322211. A98466

Numbers n such that σ(n) = 2*(n-reversal(n)). A135242

a(n) = number of distinct words arising in Post's tag system {00, 1101} applied to the word (100)ⁿ , or a(n) = -1 if this word has an unbounded trajectory. A302202

Binary numbers with 2 replacing 1 in odd positions. A95914

Pseudoprimes to base 82. A20210