22204644 has 72 divisors (see below), whose sum is σ = 65767968. Its totient is φ = 5765760.

The previous prime is 22204639. The next prime is 22204661. The reversal of 22204644 is 44640222.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4752 + ... + 8184.

It is an arithmetic number, because the mean of its divisors is an integer number (913444).

Almost surely, 2^22204644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22204644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32883984).

22204644 is an abundant number, since it is smaller than the sum of its proper divisors (43563324).

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

22204644 is a wasteful number, since it uses less digits than its factorization.

22204644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465 (or 3456 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 22204644 is about 4712.1803870395. The cubic root of 22204644 is about 281.0700719784.

Adding to 22204644 its reverse (44640222), we get a palindrome (66844866).

The spelling of 22204644 in words is "twenty-two million, two hundred four thousand, six hundred forty-four".