20787880032 has 72 divisors (see below), whose sum is σ = 59445935640. Its totient is φ = 6890565120.

The previous prime is 20787880019. The next prime is 20787880051. The reversal of 20787880032 is 23008878702.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 20787880032.

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, 150069 + ... + 253172.

It is an arithmetic number, because the mean of its divisors is an integer number (825637995).

Almost surely, 2^20787880032 is an apocalyptic number.

It is an amenable number.

20787880032 is an abundant number, since it is smaller than the sum of its proper divisors (38658055608).

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

20787880032 is a wasteful number, since it uses less digits than its factorization.

20787880032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403436 (or 403425 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 20787880032 in words is "twenty billion, seven hundred eighty-seven million, eight hundred eighty thousand, thirty-two".