22004864 has 64 divisors (see below), whose sum is σ = 51408000. Its totient is φ = 9185280.

The previous prime is 22004849. The next prime is 22004887. The reversal of 22004864 is 46840022.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36437 + ... + 37035.

It is an arithmetic number, because the mean of its divisors is an integer number (803250).

Almost surely, 2^22004864 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 22004864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25704000).

22004864 is an abundant number, since it is smaller than the sum of its proper divisors (29403136).

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

22004864 is an equidigital number, since it uses as much as digits as its factorization.

22004864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 22004864 is about 4690.9342353096. The cubic root of 22004864 is about 280.2245817246.

Adding to 22004864 its reverse (46840022), we get a palindrome (68844886).

The spelling of 22004864 in words is "twenty-two million, four thousand, eight hundred sixty-four".