18711193220 has 24 divisors (see below), whose sum is σ = 41001920064. Its totient is φ = 7159065056.

The previous prime is 18711193181. The next prime is 18711193231. The reversal of 18711193220 is 2239111781.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20337794 + ... + 20338713.

It is an arithmetic number, because the mean of its divisors is an integer number (1708413336).

Almost surely, 2^18711193220 is an apocalyptic number.

18711193220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18711193220 is an abundant number, since it is smaller than the sum of its proper divisors (22290726844).

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

18711193220 is a wasteful number, since it uses less digits than its factorization.

18711193220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40676539 (or 40676537 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 35.

The spelling of 18711193220 in words is "eighteen billion, seven hundred eleven million, one hundred ninety-three thousand, two hundred twenty".