20528988 has 24 divisors (see below), whose sum is σ = 48009360. Its totient is φ = 6827520.

The previous prime is 20528947. The next prime is 20528993. The reversal of 20528988 is 88982502.

It is a super-4 number, since 4×20528988⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4428 + ... + 7788.

It is an arithmetic number, because the mean of its divisors is an integer number (2000390).

Almost surely, 2^20528988 is an apocalyptic number.

It is an amenable number.

20528988 is an abundant number, since it is smaller than the sum of its proper divisors (27480372).

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

20528988 is a wasteful number, since it uses less digits than its factorization.

20528988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3877 (or 3875 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 20528988 is about 4530.8926272866. The cubic root of 20528988 is about 273.8141243830.

The spelling of 20528988 in words is "twenty million, five hundred twenty-eight thousand, nine hundred eighty-eight".