Properties of the Number 20869

Twenty Thousand Eight Hundred Sixty-Nine

Basics

Value: 20868 → 20869 → 20870

Parity: odd

Prime: No

Previous Prime: 20857

Next Prime: 20873

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 41 × 509

Divisors: 1, 41, 509, 20869

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000110000101

Octal: 50605

Duodecimal: 100B1

Hexadecimal: 5185

Square: 435515161

Square Root: 144.46106741956464

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

a(n) = 15·n² + 9·n + 1. A134153

Denominators of the convergents given by treating A084580 as continued fraction coefficients after the leading 0. A390652

Expansion of g²/(1 + x³*g²), where g = 1+x·g³ is the g.f. of A001764. A391298

Last term where no prime sums occur in A161190 in a 4-diagonal set of 24 terms. A161193

a(n) = ∑_y=1..n ∑_x=1..n floor((x^k + y^k)^1/k) with k = 2. A211791

Shifts 10 places left under Euler transform with a(0)=0 and a(n)=1 for n<10. A218027

Number of maximal irredundant sets in the n-Andrásfai graph. A291053

Starts of runs of at least 3 consecutive odd numbers whose prime factors are all prime-indexed primes. A357168

Number of binary strings of length n with no substrings equal to 0001 1011 or 1100. A164489

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MFI = ZSM-5 Nan[AlnSi96-nO192] starting with a T2 atom. A19159