20528250 has 64 divisors (see below), whose sum is σ = 51936768. Its totient is φ = 5400000.

The previous prime is 20528203. The next prime is 20528251. The reversal of 20528250 is 5282502.

It is a self number, because there is not a number n which added to its sum of digits gives 20528250.

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 31 ways as a sum of consecutive naturals, for example, 75615 + ... + 75885.

It is an arithmetic number, because the mean of its divisors is an integer number (811512).

Almost surely, 2^20528250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20528250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25968384).

20528250 is an abundant number, since it is smaller than the sum of its proper divisors (31408518).

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

20528250 is a wasteful number, since it uses less digits than its factorization.

20528250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20528250 is about 4530.8111856488. The cubic root of 20528250 is about 273.8108432139.

The spelling of 20528250 in words is "twenty million, five hundred twenty-eight thousand, two hundred fifty".