204423665 has 4 divisors (see below), whose sum is σ = 245308404. Its totient is φ = 163538928.

The previous prime is 204423647. The next prime is 204423673. The reversal of 204423665 is 566324402.

204423665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 107578384 + 96845281 = 10372^2 + 9841^2 .

It is a cyclic number.

It is not a de Polignac number, because 204423665 - 2²⁰ = 203375089 is a prime.

It is a Duffinian 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, 20442362 + ... + 20442371.

It is an arithmetic number, because the mean of its divisors is an integer number (61327101).

Almost surely, 2^204423665 is an apocalyptic number.

It is an amenable number.

204423665 is a deficient number, since it is larger than the sum of its proper divisors (40884739).

204423665 is an equidigital number, since it uses as much as digits as its factorization.

204423665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40884738.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 204423665 is about 14297.6804062757. The cubic root of 204423665 is about 589.0837689272.

The spelling of 204423665 in words is "two hundred four million, four hundred twenty-three thousand, six hundred sixty-five".