20528983920 has 160 divisors (see below), whose sum is σ = 65782218240. Its totient is φ = 5293163520.

The previous prime is 20528983889. The next prime is 20528983963. The reversal of 20528983920 is 2938982502.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20528983920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 851877 + ... + 875643.

It is an arithmetic number, because the mean of its divisors is an integer number (411138864).

Almost surely, 2^20528983920 is an apocalyptic number.

20528983920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20528983920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32891109120).

20528983920 is an abundant number, since it is smaller than the sum of its proper divisors (45253234320).

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

20528983920 is a wasteful number, since it uses less digits than its factorization.

20528983920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23903 (or 23897 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 20528983920 in words is "twenty billion, five hundred twenty-eight million, nine hundred eighty-three thousand, nine hundred twenty".