18085404020 has 24 divisors (see below), whose sum is σ = 37994896800. Its totient is φ = 7231200032.

The previous prime is 18085404019. The next prime is 18085404023. The reversal of 18085404020 is 2040458081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18085404023) 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, 134690 + ... + 233049.

It is an arithmetic number, because the mean of its divisors is an integer number (1583120700).

Almost surely, 2^18085404020 is an apocalyptic number.

18085404020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18085404020 is an abundant number, since it is smaller than the sum of its proper divisors (19909492780).

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

18085404020 is a wasteful number, since it uses less digits than its factorization.

18085404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370207 (or 370205 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The spelling of 18085404020 in words is "eighteen billion, eighty-five million, four hundred four thousand, twenty".