22504565 has 4 divisors (see below), whose sum is σ = 27005484. Its totient is φ = 18003648.

The previous prime is 22504541. The next prime is 22504577. The reversal of 22504565 is 56540522.

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 11785489 + 10719076 = 3433^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 22504565 - 2¹⁶ = 22439029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2250452 + ... + 2250461.

It is an arithmetic number, because the mean of its divisors is an integer number (6751371).

Almost surely, 2^22504565 is an apocalyptic number.

It is an amenable number.

22504565 is a deficient number, since it is larger than the sum of its proper divisors (4500919).

22504565 is an equidigital number, since it uses as much as digits as its factorization.

22504565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500918.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 22504565 is about 4743.8976590985. The cubic root of 22504565 is about 282.3298999487.

The spelling of 22504565 in words is "twenty-two million, five hundred four thousand, five hundred sixty-five".