22011664 has 10 divisors (see below), whose sum is σ = 42647630. Its totient is φ = 11005824.

The previous prime is 22011659. The next prime is 22011673. The reversal of 22011664 is 46611022.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 6801664 = 3900^2 + 2608^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687849 + ... + 687880.

It is an arithmetic number, because the mean of its divisors is an integer number (4264763).

Almost surely, 2^22011664 is an apocalyptic number.

It is an amenable number.

22011664 is a deficient number, since it is larger than the sum of its proper divisors (20635966).

22011664 is a wasteful number, since it uses less digits than its factorization.

22011664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375737 (or 1375731 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22011664 is about 4691.6589816397. The cubic root of 22011664 is about 280.2534439935.

Adding to 22011664 its reverse (46611022), we get a palindrome (68622686).

The spelling of 22011664 in words is "twenty-two million, eleven thousand, six hundred sixty-four".