22005665 has 12 divisors (see below), whose sum is σ = 29026452. Its totient is φ = 16003680.

The previous prime is 22005649. The next prime is 22005673. The reversal of 22005665 is 56650022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11404129 + 10601536 = 3377^2 + 3256^2 .

It is not a de Polignac number, because 22005665 - 2⁴ = 22005649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17582 + ... + 18791.

It is an arithmetic number, because the mean of its divisors is an integer number (2418871).

Almost surely, 2^22005665 is an apocalyptic number.

It is an amenable number.

22005665 is a deficient number, since it is larger than the sum of its proper divisors (7020787).

22005665 is a wasteful number, since it uses less digits than its factorization.

22005665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36400 (or 36389 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 22005665 is about 4691.0196119820. The cubic root of 22005665 is about 280.2279818391.

Adding to 22005665 its reverse (56650022), we get a palindrome (78655687).

The spelling of 22005665 in words is "twenty-two million, five thousand, six hundred sixty-five".