22005444 has 12 divisors (see below), whose sum is σ = 51346064. Its totient is φ = 7335144.

The previous prime is 22005419. The next prime is 22005449. The reversal of 22005444 is 44450022.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 22005444.

It is not an unprimeable number, because it can be changed into a prime (22005449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 916882 + ... + 916905.

Almost surely, 2^22005444 is an apocalyptic number.

It is an amenable number.

22005444 is an abundant number, since it is smaller than the sum of its proper divisors (29340620).

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

22005444 is a wasteful number, since it uses less digits than its factorization.

22005444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833794 (or 1833792 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 22005444 is about 4690.9960562763. The cubic root of 22005444 is about 280.2270437383.

Adding to 22005444 its reverse (44450022), we get a palindrome (66455466).

The spelling of 22005444 in words is "twenty-two million, five thousand, four hundred forty-four".