204720117 has 16 divisors (see below), whose sum is σ = 328373760. Its totient is φ = 110825712.

The previous prime is 204720107. The next prime is 204720121. The reversal of 204720117 is 711027402.

It is not a de Polignac number, because 204720117 - 2¹⁰ = 204719093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204720107) 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 15 ways as a sum of consecutive naturals, for example, 256143 + ... + 256940.

It is an arithmetic number, because the mean of its divisors is an integer number (20523360).

Almost surely, 2^204720117 is an apocalyptic number.

It is an amenable number.

204720117 is a deficient number, since it is larger than the sum of its proper divisors (123653643).

204720117 is a wasteful number, since it uses less digits than its factorization.

204720117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513112.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 204720117 is about 14308.0437866258. The cubic root of 204720117 is about 589.3683914075.

Adding to 204720117 its reverse (711027402), we get a palindrome (915747519).

The spelling of 204720117 in words is "two hundred four million, seven hundred twenty thousand, one hundred seventeen".