204040645 has 8 divisors (see below), whose sum is σ = 245068056. Its totient is φ = 163086336.

The previous prime is 204040589. The next prime is 204040649. The reversal of 204040645 is 546040402.

It can be written as a sum of positive squares in 4 ways, for example, as 111534721 + 92505924 = 10561^2 + 9618^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204040645 - 2⁷ = 204040517 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 (204040649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11932 + ... + 23461.

It is an arithmetic number, because the mean of its divisors is an integer number (30633507).

Almost surely, 2^204040645 is an apocalyptic number.

It is an amenable number.

204040645 is a deficient number, since it is larger than the sum of its proper divisors (41027411).

204040645 is a wasteful number, since it uses less digits than its factorization.

204040645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36551.

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

The square root of 204040645 is about 14284.2796458204. The cubic root of 204040645 is about 588.7156251013.

The spelling of 204040645 in words is "two hundred four million, forty thousand, six hundred forty-five".