Properties of the Number 20617

Twenty Thousand Six Hundred Seventeen

Basics

Value: 20616 → 20617 → 20618

Parity: odd

Prime: No

Previous Prime: 20611

Next Prime: 20627

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 53 × 389

Divisors: 1, 53, 389, 20617

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000010001001

Octal: 50211

Duodecimal: BB21

Hexadecimal: 5089

Square: 425060689

Square Root: 143.58621103713267

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 k such that the decimal digits of φ(k) are a permutation of those of k. A115921

a(n) = numerator of fraction whose decimal representation is (n).(1)(2)(3)...(n-1)(n). A172495

a(n) = 1 + a(n-1) + a(n-2) + a(n-3) if n>=4; a(1) = a(2) = a(3) = 1. A248098

Numbers k such that k![14]-2 is prime, where k![14] is the fourteen-fold multifactorial. A284190

Composite hypotenuses of primitive Pythagorean triangles (A120961) that are not circumdiameters of non-Pythagorean primitive Heronian triangles (A285579). A329148

50k²-20k-23 interleaved with 50k²+30k+17 for k=>0. A217894

[ sqrt(3/2)ⁿ ]. A14215

Numbers n>1 with the property that the decimal expansion of n is a permutation of the digits of the decimal expansion of φ(n) and the ratio n/φ(n) is a new record low value. A102018

Triangle read by rows based on the Stirling numbers S1: t(n,m)=Sum[(-1)^{n + 1}* StirlingS1[n, j]*(k + 1 - j)^{n - 1}, {j, 0, k + 1}]. A152918

Smallest nonempty set S containing prime divisors of 8k+3 for each k in S. A20617