18520220708 has 48 divisors (see below), whose sum is σ = 35542100160. Its totient is φ = 8374272000.

The previous prime is 18520220603. The next prime is 18520220713. The reversal of 18520220708 is 80702202581.

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, 11567108 + ... + 11568708.

It is an arithmetic number, because the mean of its divisors is an integer number (740460420).

Almost surely, 2^18520220708 is an apocalyptic number.

It is an amenable number.

18520220708 is a deficient number, since it is larger than the sum of its proper divisors (17021879452).

18520220708 is a wasteful number, since it uses less digits than its factorization.

18520220708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828 (or 2826 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The spelling of 18520220708 in words is "eighteen billion, five hundred twenty million, two hundred twenty thousand, seven hundred eight".