204392317 has 4 divisors (see below), whose sum is σ = 204509116. Its totient is φ = 204275520.

The previous prime is 204392299. The next prime is 204392333. The reversal of 204392317 is 713293402.

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 170589721 + 33802596 = 13061^2 + 5814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204392317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204392117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55734 + ... + 59287.

It is an arithmetic number, because the mean of its divisors is an integer number (51127279).

Almost surely, 2^204392317 is an apocalyptic number.

It is an amenable number.

204392317 is a deficient number, since it is larger than the sum of its proper divisors (116799).

204392317 is a wasteful number, since it uses less digits than its factorization.

204392317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116798.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 204392317 is about 14296.5841025050. The cubic root of 204392317 is about 589.0536557437.

The spelling of 204392317 in words is "two hundred four million, three hundred ninety-two thousand, three hundred seventeen".