20113810128 has 120 divisors (see below), whose sum is σ = 56681788800. Its totient is φ = 6658198272.

The previous prime is 20113810069. The next prime is 20113810133. The reversal of 20113810128 is 82101831102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23973133 + ... + 23973971.

It is an arithmetic number, because the mean of its divisors is an integer number (472348240).

Almost surely, 2^20113810128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20113810128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28340894400).

20113810128 is an abundant number, since it is smaller than the sum of its proper divisors (36567978672).

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

20113810128 is a wasteful number, since it uses less digits than its factorization.

20113810128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The spelling of 20113810128 in words is "twenty billion, one hundred thirteen million, eight hundred ten thousand, one hundred twenty-eight".