20258 has 8 divisors (see below), whose sum is σ = 34752. Its totient is φ = 8676.

The previous prime is 20249. The next prime is 20261. The reversal of 20258 is 85202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 12 and base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710 + ... + 737.

It is an arithmetic number, because the mean of its divisors is an integer number (4344).

2²⁰²⁵⁸ is an apocalyptic number.

20258 is a deficient number, since it is larger than the sum of its proper divisors (14494).

20258 is a wasteful number, since it uses less digits than its factorization.

20258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20258 is about 142.3306010667. The cubic root of 20258 is about 27.2603977939.

The spelling of 20258 in words is "twenty thousand, two hundred fifty-eight".