22009218 has 32 divisors (see below), whose sum is σ = 54881280. Its totient is φ = 5716560.

The previous prime is 22009189. The next prime is 22009241. The reversal of 22009218 is 81290022.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 23358 + ... + 24281.

It is an arithmetic number, because the mean of its divisors is an integer number (1715040).

Almost surely, 2^22009218 is an apocalyptic number.

22009218 is an abundant number, since it is smaller than the sum of its proper divisors (32872062).

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

22009218 is a wasteful number, since it uses less digits than its factorization.

22009218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47662.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 22009218 is about 4691.3982990149. The cubic root of 22009218 is about 280.2430627503.

The spelling of 22009218 in words is "twenty-two million, nine thousand, two hundred eighteen".