20258256 has 80 divisors (see below), whose sum is σ = 55899200. Its totient is φ = 6303744.

The previous prime is 20258213. The next prime is 20258261. The reversal of 20258256 is 65285202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88350 + ... + 88578.

It is an arithmetic number, because the mean of its divisors is an integer number (698740).

Almost surely, 2^20258256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20258256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27949600).

20258256 is an abundant number, since it is smaller than the sum of its proper divisors (35640944).

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

20258256 is a wasteful number, since it uses less digits than its factorization.

20258256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20258256 is about 4500.9172398523. The cubic root of 20258256 is about 272.6051262316.

The spelling of 20258256 in words is "twenty million, two hundred fifty-eight thousand, two hundred fifty-six".