20388890928 has 40 divisors (see below), whose sum is σ = 60195774208. Its totient is φ = 5825397312.

The previous prime is 20388890923. The next prime is 20388890939. The reversal of 20388890928 is 82909888302.

It is not an unprimeable number, because it can be changed into a prime (20388890923) 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 7 ways as a sum of consecutive naturals, for example, 30340276 + ... + 30340947.

Almost surely, 2^20388890928 is an apocalyptic number.

20388890928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20388890928 is an abundant number, since it is smaller than the sum of its proper divisors (39806883280).

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

20388890928 is a wasteful number, since it uses less digits than its factorization.

20388890928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60681241 (or 60681235 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 57.

The spelling of 20388890928 in words is "twenty billion, three hundred eighty-eight million, eight hundred ninety thousand, nine hundred twenty-eight".