22005745 has 8 divisors (see below), whose sum is σ = 26433000. Its totient is φ = 17587200.

The previous prime is 22005719. The next prime is 22005749. The reversal of 22005745 is 54750022.

It can be written as a sum of positive squares in 4 ways, for example, as 4566769 + 17438976 = 2137^2 + 4176^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22005745 - 2⁷ = 22005617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22005749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6631 + ... + 9379.

It is an arithmetic number, because the mean of its divisors is an integer number (3304125).

Almost surely, 2^22005745 is an apocalyptic number.

It is an amenable number.

22005745 is a deficient number, since it is larger than the sum of its proper divisors (4427255).

22005745 is a wasteful number, since it uses less digits than its factorization.

22005745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 22005745 is about 4691.0281389052. The cubic root of 22005745 is about 280.2283214215.

Adding to 22005745 its reverse (54750022), we get a palindrome (76755767).

The spelling of 22005745 in words is "twenty-two million, five thousand, seven hundred forty-five".