20258664 has 16 divisors (see below), whose sum is σ = 50646720. Its totient is φ = 6752880.

The previous prime is 20258663. The next prime is 20258737. The reversal of 20258664 is 46685202.

It is not an unprimeable number, because it can be changed into a prime (20258663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422032 + ... + 422079.

It is an arithmetic number, because the mean of its divisors is an integer number (3165420).

Almost surely, 2^20258664 is an apocalyptic number.

20258664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20258664 is an abundant number, since it is smaller than the sum of its proper divisors (30388056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20258664 is a wasteful number, since it uses less digits than its factorization.

20258664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844120 (or 844116 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 20258664 is about 4500.9625637190. The cubic root of 20258664 is about 272.6069563027.

The spelling of 20258664 in words is "twenty million, two hundred fifty-eight thousand, six hundred sixty-four".