18173605220 has 12 divisors (see below), whose sum is σ = 38164571004. Its totient is φ = 7269442080.

The previous prime is 18173605187. The next prime is 18173605231. The reversal of 18173605220 is 2250637181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1910214436 + 16263390784 = 43706^2 + 127528^2 .

It is a super-2 number, since 2×18173605220² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454340111 + ... + 454340150.

It is an arithmetic number, because the mean of its divisors is an integer number (3180380917).

Almost surely, 2^18173605220 is an apocalyptic number.

18173605220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18173605220 is an abundant number, since it is smaller than the sum of its proper divisors (19990965784).

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

18173605220 is a wasteful number, since it uses less digits than its factorization.

18173605220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908680270 (or 908680268 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 18173605220 in words is "eighteen billion, one hundred seventy-three million, six hundred five thousand, two hundred twenty".