20787803028 has 36 divisors (see below), whose sum is σ = 52555825140. Its totient is φ = 6928096896.

The previous prime is 20787803027. The next prime is 20787803033. The reversal of 20787803028 is 82030878702.

It can be written as a sum of positive squares in 2 ways, for example, as 7256995344 + 13530807684 = 85188^2 + 116322^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787803027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182226 + ... + 273462.

Almost surely, 2^20787803028 is an apocalyptic number.

It is an amenable number.

20787803028 is an abundant number, since it is smaller than the sum of its proper divisors (31768022112).

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

20787803028 is a wasteful number, since it uses less digits than its factorization.

20787803028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97576 (or 97571 counting only the distinct ones).

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

The spelling of 20787803028 in words is "twenty billion, seven hundred eighty-seven million, eight hundred three thousand, twenty-eight".