Properties of the Number 20615

Twenty Thousand Six Hundred Fifteen

Basics

Value: 20614 → 20615 → 20616

Parity: odd

Prime: No

Previous Prime: 20611

Next Prime: 20627

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 5 × 7 × 19 × 31

Divisors: 1, 5, 7, 19, 31, 35, 95, 133, 155, 217

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101000010000111

Octal: 50207

Duodecimal: BB1B

Hexadecimal: 5087

Square: 424978225

Square Root: 143.57924641117182

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

Stirling numbers of the first kind: s(n+2, n). A914

Partial sums of A299258. A299264

Smallest order of cyclotomic polynomial containing n or -n as a coefficient. A13594

Indices of records in heights of cyclotomic polynomials (A160338). A160340

Number of zeros in character table of symmetric group S_n. A6907

Number of partitions p of n including round(mean(p)) as a part. (This is "Mathematica round"). A241338

Numerator of ∏_j=1..n-1 ((3·j+1)/(3·j+2)). A271919

Least k such that the k-th cyclotomic polynomial has n as a coefficient. A262404

Numbers k such that ω(k) = 4 and the largest prime factor of k equals the sum of its remaining distinct prime factors, where ω(k) = A001221(k). A383728

Numbers n such that the cyclotomic polynomial of order n has a nonzero coefficient which does not appear in any cyclotomic polynomials of lower order. A46887