22201644 has 24 divisors (see below), whose sum is σ = 52291008. Its totient is φ = 7330960.

The previous prime is 22201579. The next prime is 22201661. The reversal of 22201644 is 44610222.

It is a self number, because there is not a number n which added to its sum of digits gives 22201644.

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 7 ways as a sum of consecutive naturals, for example, 7362 + ... + 9929.

It is an arithmetic number, because the mean of its divisors is an integer number (2178792).

Almost surely, 2^22201644 is an apocalyptic number.

It is an amenable number.

22201644 is an abundant number, since it is smaller than the sum of its proper divisors (30089364).

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

22201644 is a wasteful number, since it uses less digits than its factorization.

22201644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17405 (or 17403 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 22201644 is about 4711.8620523101. The cubic root of 22201644 is about 281.0574132422.

Adding to 22201644 its reverse (44610222), we get a palindrome (66811866).

The spelling of 22201644 in words is "twenty-two million, two hundred one thousand, six hundred forty-four".