205304605 has 16 divisors (see below), whose sum is σ = 269252928. Its totient is φ = 149040000.

The previous prime is 205304591. The next prime is 205304609. The reversal of 205304605 is 506403502.

It is not a de Polignac number, because 205304605 - 2⁵ = 205304573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205304605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205304609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29950 + ... + 36160.

It is an arithmetic number, because the mean of its divisors is an integer number (16828308).

Almost surely, 2^205304605 is an apocalyptic number.

It is an amenable number.

205304605 is a deficient number, since it is larger than the sum of its proper divisors (63948323).

205304605 is a wasteful number, since it uses less digits than its factorization.

205304605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 205304605 is about 14328.4543828007. The cubic root of 205304605 is about 589.9287522890.

The spelling of 205304605 in words is "two hundred five million, three hundred four thousand, six hundred five".