18022180 has 24 divisors (see below), whose sum is σ = 41287680. Its totient is φ = 6553440.

The previous prime is 18022177. The next prime is 18022201. The reversal of 18022180 is 8122081.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40740 + ... + 41179.

It is an arithmetic number, because the mean of its divisors is an integer number (1720320).

Almost surely, 2^18022180 is an apocalyptic number.

18022180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18022180 is an abundant number, since it is smaller than the sum of its proper divisors (23265500).

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

18022180 is a wasteful number, since it uses less digits than its factorization.

18022180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81939 (or 81937 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 18022180 is about 4245.2538204447. The cubic root of 18022180 is about 262.1817397633.

Subtracting from 18022180 its reverse (8122081), we obtain a palindrome (9900099).

The spelling of 18022180 in words is "eighteen million, twenty-two thousand, one hundred eighty".