18220146 has 16 divisors (see below), whose sum is σ = 41646144. Its totient is φ = 5205744.

The previous prime is 18220127. The next prime is 18220159. The reversal of 18220146 is 64102281.

It is a super-2 number, since 2×18220146² = 663947440522632, which contains 22 as substring.

It is a Curzon 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, 216865 + ... + 216948.

It is an arithmetic number, because the mean of its divisors is an integer number (2602884).

Almost surely, 2^18220146 is an apocalyptic number.

18220146 is an abundant number, since it is smaller than the sum of its proper divisors (23425998).

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

18220146 is a wasteful number, since it uses less digits than its factorization.

18220146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433825.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18220146 is about 4268.5062961181. The cubic root of 18220146 is about 263.1382311020.

The spelling of 18220146 in words is "eighteen million, two hundred twenty thousand, one hundred forty-six".