18191110020 has 48 divisors (see below), whose sum is σ = 51193695168. Its totient is φ = 4826335360.

The previous prime is 18191110019. The next prime is 18191110033. The reversal of 18191110020 is 2001119181.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 757686 + ... + 781325.

It is an arithmetic number, because the mean of its divisors is an integer number (1066535316).

Almost surely, 2^18191110020 is an apocalyptic number.

18191110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18191110020 is an abundant number, since it is smaller than the sum of its proper divisors (33002585148).

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

18191110020 is a wasteful number, since it uses less digits than its factorization.

18191110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539220 (or 1539218 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 24.

The spelling of 18191110020 in words is "eighteen billion, one hundred ninety-one million, one hundred ten thousand, twenty".