22009566 has 32 divisors (see below), whose sum is σ = 45720576. Its totient is φ = 7056000.

The previous prime is 22009553. The next prime is 22009601. The reversal of 22009566 is 66590022.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44581 + ... + 45071.

It is an arithmetic number, because the mean of its divisors is an integer number (1428768).

Almost surely, 2^22009566 is an apocalyptic number.

22009566 is an abundant number, since it is smaller than the sum of its proper divisors (23711010).

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

22009566 is a wasteful number, since it uses less digits than its factorization.

22009566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 22009566 is about 4691.4353880236. The cubic root of 22009566 is about 280.2445397688.

Adding to 22009566 its reverse (66590022), we get a palindrome (88599588).

The spelling of 22009566 in words is "twenty-two million, nine thousand, five hundred sixty-six".