18005022320 has 40 divisors (see below), whose sum is σ = 44324131824. Its totient is φ = 6778360832.

The previous prime is 18005022317. The next prime is 18005022341. The reversal of 18005022320 is 2322050081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 6618134 + ... + 6620853.

Almost surely, 2^18005022320 is an apocalyptic number.

18005022320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18005022320 is an abundant number, since it is smaller than the sum of its proper divisors (26319109504).

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

18005022320 is a wasteful number, since it uses less digits than its factorization.

18005022320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13239017 (or 13239011 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 18005022320 in words is "eighteen billion, five million, twenty-two thousand, three hundred twenty".