20528980 has 12 divisors (see below), whose sum is σ = 43110900. Its totient is φ = 8211584.

The previous prime is 20528947. The next prime is 20528993. The reversal of 20528980 is 8982502.

It can be written as a sum of positive squares in 2 ways, for example, as 11600836 + 8928144 = 3406^2 + 2988^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513205 + ... + 513244.

It is an arithmetic number, because the mean of its divisors is an integer number (3592575).

Almost surely, 2^20528980 is an apocalyptic number.

20528980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20528980 is an abundant number, since it is smaller than the sum of its proper divisors (22581920).

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

20528980 is a wasteful number, since it uses less digits than its factorization.

20528980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026458 (or 1026456 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 20528980 is about 4530.8917444583. The cubic root of 20528980 is about 273.8140888152.

The spelling of 20528980 in words is "twenty million, five hundred twenty-eight thousand, nine hundred eighty".