22005128 has 8 divisors (see below), whose sum is σ = 41259630. Its totient is φ = 11002560.

The previous prime is 22005127. The next prime is 22005131. The reversal of 22005128 is 82150022.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 1737124 = 4502^2 + 1318^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (22005127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1375313 + ... + 1375328.

Almost surely, 2^22005128 is an apocalyptic number.

It is an amenable number.

22005128 is a deficient number, since it is larger than the sum of its proper divisors (19254502).

22005128 is a wasteful number, since it uses less digits than its factorization.

22005128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750647 (or 2750643 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 22005128 is about 4690.9623746093. The cubic root of 22005128 is about 280.2257023707.

The spelling of 22005128 in words is "twenty-two million, five thousand, one hundred twenty-eight".