22205725 has 12 divisors (see below), whose sum is σ = 27822004. Its totient is φ = 17579520.

The previous prime is 22205713. The next prime is 22205731. The reversal of 22205725 is 52750222.

It can be written as a sum of positive squares in 6 ways, for example, as 2968729 + 19236996 = 1723^2 + 4386^2 .

It is not a de Polignac number, because 22205725 - 2⁵ = 22205693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 22205725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2154 + ... + 7003.

Almost surely, 2^22205725 is an apocalyptic number.

22205725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22205725 is a deficient number, since it is larger than the sum of its proper divisors (5616279).

22205725 is an equidigital number, since it uses as much as digits as its factorization.

22205725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9264 (or 9259 counting only the distinct ones).

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

The square root of 22205725 is about 4712.2950883832. The cubic root of 22205725 is about 281.0746330636.

Adding to 22205725 its reverse (52750222), we get a palindrome (74955947).

The spelling of 22205725 in words is "twenty-two million, two hundred five thousand, seven hundred twenty-five".