20528256 has 96 divisors (see below), whose sum is σ = 63488880. Its totient is φ = 5859840.

The previous prime is 20528251. The next prime is 20528267. The reversal of 20528256 is 65282502.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (20528251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18271 + ... + 19361.

Almost surely, 2^20528256 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 20528256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31744440).

20528256 is an abundant number, since it is smaller than the sum of its proper divisors (42960624).

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

20528256 is a wasteful number, since it uses less digits than its factorization.

20528256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1103 counting only the distinct ones).

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

The square root of 20528256 is about 4530.8118477818. The cubic root of 20528256 is about 273.8108698903.

The spelling of 20528256 in words is "twenty million, five hundred twenty-eight thousand, two hundred fifty-six".