Properties of the Number 20387

Twenty Thousand Three Hundred Eighty-Seven

Basics

Value: 20386 → 20387 → 20388

Parity: odd

Prime: No

Previous Prime: 20369

Next Prime: 20389

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 19 × 29 × 37

Divisors: 1, 19, 29, 37, 551, 703, 1073, 20387

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111110100011

Octal: 47643

Duodecimal: B96B

Hexadecimal: 4fa3

Square: 415629769

Square Root: 142.78305221559035

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 benzenoids with 22 hexagons, C_2v symmetry and containing n carbon atoms. A123106

a(n) = ∑_m=1..n T(m,n+1-m), array T as in A048887. A48888

Number of Ramanujan primes <= 2ⁿ. A190502

Non-semiprime composite numbers e such that there is no 0<a<b<c<d<e for which a! * b! * c! * d! * e! is a perfect square. A392333

Wagstaff primes: primes of form (2^p + 1)/3. A979

Numbers k such that the continued fraction for sqrt(k) has period 48. A20387