22505345 has 4 divisors (see below), whose sum is σ = 27006420. Its totient is φ = 18004272.

The previous prime is 22505333. The next prime is 22505369. The reversal of 22505345 is 54350522.

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 11262736 + 11242609 = 3356^2 + 3353^2 .

It is a cyclic number.

It is not a de Polignac number, because 22505345 - 2⁸ = 22505089 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 2250530 + ... + 2250539.

It is an arithmetic number, because the mean of its divisors is an integer number (6751605).

Almost surely, 2^22505345 is an apocalyptic number.

It is an amenable number.

22505345 is a deficient number, since it is larger than the sum of its proper divisors (4501075).

22505345 is an equidigital number, since it uses as much as digits as its factorization.

22505345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501074.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 22505345 is about 4743.9798692659. The cubic root of 22505345 is about 282.3331617280. Note that the first 3 decimals are identical.

Adding to 22505345 its reverse (54350522), we get a palindrome (76855867).

The spelling of 22505345 in words is "twenty-two million, five hundred five thousand, three hundred forty-five".