22005657 has 6 divisors (see below), whose sum is σ = 31785962. Its totient is φ = 14670432.

The previous prime is 22005649. The next prime is 22005673. The reversal of 22005657 is 75650022.

22005657 is a `hidden beast` number, since 2 + 2 + 0 + 0 + 5 + 657 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 2742336 = 4389^2 + 1656^2 .

It is not a de Polignac number, because 22005657 - 2³ = 22005649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22005657.

It is not an unprimeable number, because it can be changed into a prime (22005617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1222528 + ... + 1222545.

Almost surely, 2^22005657 is an apocalyptic number.

It is an amenable number.

22005657 is a deficient number, since it is larger than the sum of its proper divisors (9780305).

22005657 is a wasteful number, since it uses less digits than its factorization.

22005657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445079 (or 2445076 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 22005657 is about 4691.0187592889. The cubic root of 22005657 is about 280.2279478808.

Adding to 22005657 its reverse (75650022), we get a palindrome (97655679).

The spelling of 22005657 in words is "twenty-two million, five thousand, six hundred fifty-seven".