20988857604 has 96 divisors (see below), whose sum is σ = 60564188160. Its totient is φ = 5562000000.

The previous prime is 20988857599. The next prime is 20988857671. The reversal of 20988857604 is 40675888902.

It is a Harshad number since it is a multiple of its sum of digits (57).

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, 289272 + ... + 354479.

It is an arithmetic number, because the mean of its divisors is an integer number (630876960).

Almost surely, 2^20988857604 is an apocalyptic number.

It is an amenable number.

20988857604 is an abundant number, since it is smaller than the sum of its proper divisors (39575330556).

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

20988857604 is a wasteful number, since it uses less digits than its factorization.

20988857604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643801 (or 643799 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 20988857604 in words is "twenty billion, nine hundred eighty-eight million, eight hundred fifty-seven thousand, six hundred four".