18517020220 has 48 divisors (see below), whose sum is σ = 39644186400. Its totient is φ = 7262518016.

The previous prime is 18517020163. The next prime is 18517020229. The reversal of 18517020220 is 2202071581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18517020229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2061459 + ... + 2070421.

It is an arithmetic number, because the mean of its divisors is an integer number (825920550).

Almost surely, 2^18517020220 is an apocalyptic number.

18517020220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18517020220 is an abundant number, since it is smaller than the sum of its proper divisors (21127166180).

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

18517020220 is a wasteful number, since it uses less digits than its factorization.

18517020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10974 (or 10972 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The spelling of 18517020220 in words is "eighteen billion, five hundred seventeen million, twenty thousand, two hundred twenty".