20099888920 has 16 divisors (see below), whose sum is σ = 45224750160. Its totient is φ = 8039955552.

The previous prime is 20099888849. The next prime is 20099888947. The reversal of 20099888920 is 2988899002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251248572 + ... + 251248651.

It is an arithmetic number, because the mean of its divisors is an integer number (2826546885).

Almost surely, 2^20099888920 is an apocalyptic number.

20099888920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20099888920 is an abundant number, since it is smaller than the sum of its proper divisors (25124861240).

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

20099888920 is a wasteful number, since it uses less digits than its factorization.

20099888920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502497234 (or 502497230 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 20099888920 in words is "twenty billion, ninety-nine million, eight hundred eighty-eight thousand, nine hundred twenty".