Properties of the Number 20987

Twenty Thousand Nine Hundred Eighty-Seven

Basics

Value: 20986 → 20987 → 20988

Parity: odd

Prime: No

Previous Prime: 20983

Next Prime: 21001

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 31 × 677

Divisors: 1, 31, 677, 20987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000111111011

Octal: 50773

Duodecimal: 1018B

Hexadecimal: 51fb

Square: 440454169

Square Root: 144.86890625665674

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

Number of partitions of n in which the least part is even. A26805

Number of integer partitions of n whose length can be written as a nonnegative linear combination of the distinct parts. A367218

Number of partitions of n such that the (sum of distinct odd parts) <= n/2. A284613

Number of binary strings of length n with no substrings equal to 0000, 0001, or 1010. A164414

Zero-one version of Golay-Rudin-Shapiro sequence (or word). A20987

Iterated partial sums of prime numbers, square array read by diagonals. A254858