Properties of the Number 20902

Twenty Thousand Nine Hundred Two

Basics

Value: 20901 → 20902 → 20903

Parity: even

Prime: No

Previous Prime: 20899

Next Prime: 20903

Digit Sum: 13

Digital Root: 4

Palindrome: Yes

Factorization: 2 × 7 × 1493

Divisors: 1, 2, 7, 14, 1493, 2986, 10451, 20902

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000110100110

Octal: 50646

Duodecimal: 1011A

Hexadecimal: 51a6

Square: 436893604

Square Root: 144.57523992717427

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

O.g.f. A(x) satisfies: [xⁿ] exp( x·A(x) ) * (n² + 1 - A(x)) = 0 for n >= 0. A305114

Base-10 palindromes that start with 2. A43037

Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format D.M.YY. The terms are listed as numbers (without the dots). A210890

Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format D.M.YY. The terms are listed as numbers. Leading zeros of the terms are suppressed. A210892

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n) - 1, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences. A295960

Palindromes in A085932. A85933

a(n) = (∑_i=1..n-1 i^n-2) mod n³. A284759

a(n) = 2·a(n-1) - a(n-3) for n >= 5, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 22. A289107

Palindromes that can be written as the sum of two palindromic primes. A356824

Palindromic even numbers with an odd number of distinct prime factors. A75809