Properties of the Number 20390

Twenty Thousand Three Hundred Ninety

Basics

Value: 20389 → 20390 → 20391

Parity: even

Prime: No

Previous Prime: 20389

Next Prime: 20393

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 5 × 2039

Divisors: 1, 2, 5, 10, 2039, 4078, 10195, 20390

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111110100110

Octal: 47646

Duodecimal: B972

Hexadecimal: 4fa6

Square: 415752100

Square Root: 142.7935572776307

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 primes p between powers of 2, 2ⁿ < p <= 2ⁿ⁺¹. A36378

a(n) = the number of noncomposites (primes or 1) that are n digits long when written in binary. A162145

a(n) = A342001(A342456(n)); "wild part" of the arithmetic derivative of A342456(n). A342463

Least positive integer k such that 1 + 1/2 + ... + 1/k > n/2. A226161

Transform of the finite sequence (1, 0, -1, 0, 1, 0, -1) by the T_0,0 transformation (see link). A159349

Number of binary strings of length n with equal numbers of 0001 and 0101 substrings. A164158

Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite BEA = β Na7[Al7Si57O128] starting with a T1 atom. A19067

Number of n-bit primes. A374403

Number of lines in Pratt certificate for n-th prime. A37202

Numbers k such that the continued fraction for sqrt(k) has period 51. A20390