204591945 has 8 divisors (see below), whose sum is σ = 327347136. Its totient is φ = 109115696.

The previous prime is 204591931. The next prime is 204591949. The reversal of 204591945 is 549195402.

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 204591945 - 2⁵ = 204591913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204591949) 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, 6819717 + ... + 6819746.

It is an arithmetic number, because the mean of its divisors is an integer number (40918392).

Almost surely, 2^204591945 is an apocalyptic number.

It is an amenable number.

204591945 is a deficient number, since it is larger than the sum of its proper divisors (122755191).

204591945 is a wasteful number, since it uses less digits than its factorization.

204591945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13639471.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 204591945 is about 14303.5640663437. The cubic root of 204591945 is about 589.2453676797.

It can be divided in two parts, 20 and 4591945, that added together give a triangular number (4591965 = T₃₀₃₀).

The spelling of 204591945 in words is "two hundred four million, five hundred ninety-one thousand, nine hundred forty-five".