20790880128 has 96 divisors (see below), whose sum is σ = 59856488640. Its totient is φ = 6926985216.

The previous prime is 20790880109. The next prime is 20790880139. The reversal of 20790880128 is 82108809702.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4136625 + ... + 4141647.

It is an arithmetic number, because the mean of its divisors is an integer number (623505090).

Almost surely, 2^20790880128 is an apocalyptic number.

It is an amenable number.

20790880128 is an abundant number, since it is smaller than the sum of its proper divisors (39065608512).

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

20790880128 is a wasteful number, since it uses less digits than its factorization.

20790880128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8636 (or 8621 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 20790880128 in words is "twenty billion, seven hundred ninety million, eight hundred eighty thousand, one hundred twenty-eight".