22508905 has 4 divisors (see below), whose sum is σ = 27010692. Its totient is φ = 18007120.

The previous prime is 22508903. The next prime is 22508923. The reversal of 22508905 is 50980522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15555136 + 6953769 = 3944^2 + 2637^2 .

It is not a de Polignac number, because 22508905 - 2¹ = 22508903 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22508903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2250886 + ... + 2250895.

It is an arithmetic number, because the mean of its divisors is an integer number (6752673).

Almost surely, 2^22508905 is an apocalyptic number.

It is an amenable number.

22508905 is a deficient number, since it is larger than the sum of its proper divisors (4501787).

22508905 is an equidigital number, since it uses as much as digits as its factorization.

22508905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501786.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 22508905 is about 4744.3550668136. The cubic root of 22508905 is about 282.3480478668.

The spelling of 22508905 in words is "twenty-two million, five hundred eight thousand, nine hundred five".