22005765 has 24 divisors (see below), whose sum is σ = 38296440. Its totient is φ = 11689344.

The previous prime is 22005749. The next prime is 22005791. The reversal of 22005765 is 56750022.

It can be written as a sum of positive squares in 4 ways, for example, as 7306209 + 14699556 = 2703^2 + 3834^2 .

It is not a de Polignac number, because 22005765 - 2⁴ = 22005749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12351 + ... + 14019.

It is an arithmetic number, because the mean of its divisors is an integer number (1595685).

Almost surely, 2^22005765 is an apocalyptic number.

It is an amenable number.

22005765 is a deficient number, since it is larger than the sum of its proper divisors (16290675).

22005765 is a wasteful number, since it uses less digits than its factorization.

22005765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973 (or 1970 counting only the distinct ones).

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

The square root of 22005765 is about 4691.0302706335. The cubic root of 22005765 is about 280.2284063170.

Adding to 22005765 its reverse (56750022), we get a palindrome (78755787).

The spelling of 22005765 in words is "twenty-two million, five thousand, seven hundred sixty-five".