20785516728 has 16 divisors (see below), whose sum is σ = 51963791880. Its totient is φ = 6928505568.

The previous prime is 20785516727. The next prime is 20785516757. The reversal of 20785516728 is 82761558702.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785516721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433031575 + ... + 433031622.

Almost surely, 2^20785516728 is an apocalyptic number.

It is an amenable number.

20785516728 is an abundant number, since it is smaller than the sum of its proper divisors (31178275152).

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

20785516728 is a wasteful number, since it uses less digits than its factorization.

20785516728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866063206 (or 866063202 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 51.

The spelling of 20785516728 in words is "twenty billion, seven hundred eighty-five million, five hundred sixteen thousand, seven hundred twenty-eight".