20018371872 has 48 divisors (see below), whose sum is σ = 52589507040. Its totient is φ = 6667548672.

The previous prime is 20018371853. The next prime is 20018371873. The reversal of 20018371872 is 27817381002.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20018371872.

It is not an unprimeable number, because it can be changed into a prime (20018371873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41904 + ... + 204432.

It is an arithmetic number, because the mean of its divisors is an integer number (1095614730).

Almost surely, 2^20018371872 is an apocalyptic number.

It is an amenable number.

20018371872 is an abundant number, since it is smaller than the sum of its proper divisors (32571135168).

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

20018371872 is a wasteful number, since it uses less digits than its factorization.

20018371872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163825 (or 163817 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The spelling of 20018371872 in words is "twenty billion, eighteen million, three hundred seventy-one thousand, eight hundred seventy-two".