204243305 has 16 divisors (see below), whose sum is σ = 282316800. Its totient is φ = 138946752.

The previous prime is 204243301. The next prime is 204243307. The reversal of 204243305 is 503342402.

It is not a de Polignac number, because 204243305 - 2² = 204243301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204243301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18530 + ... + 27419.

It is an arithmetic number, because the mean of its divisors is an integer number (17644800).

Almost surely, 2^204243305 is an apocalyptic number.

It is an amenable number.

204243305 is a deficient number, since it is larger than the sum of its proper divisors (78073495).

204243305 is a wasteful number, since it uses less digits than its factorization.

204243305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46088.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 204243305 is about 14291.3716976363. The cubic root of 204243305 is about 588.9104712961.

Adding to 204243305 its reverse (503342402), we get a palindrome (707585707).

The spelling of 204243305 in words is "two hundred four million, two hundred forty-three thousand, three hundred five".