22204645 has 4 divisors (see below), whose sum is σ = 26645580. Its totient is φ = 17763712.

The previous prime is 22204639. The next prime is 22204661. The reversal of 22204645 is 54640222.

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 9345249 + 12859396 = 3057^2 + 3586^2 .

It is a cyclic number.

It is not a de Polignac number, because 22204645 - 2²³ = 13816037 is a prime.

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, 2220460 + ... + 2220469.

It is an arithmetic number, because the mean of its divisors is an integer number (6661395).

Almost surely, 2^22204645 is an apocalyptic number.

It is an amenable number.

22204645 is a deficient number, since it is larger than the sum of its proper divisors (4440935).

22204645 is an equidigital number, since it uses as much as digits as its factorization.

22204645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440934.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 22204645 is about 4712.1804931475. The cubic root of 22204645 is about 281.0700761978.

Adding to 22204645 its reverse (54640222), we get a palindrome (76844867).

The spelling of 22204645 in words is "twenty-two million, two hundred four thousand, six hundred forty-five".