205042305 has 16 divisors (see below), whose sum is σ = 353304000. Its totient is φ = 100943808.

The previous prime is 205042297. The next prime is 205042307. The reversal of 205042305 is 503240502.

It is not a de Polignac number, because 205042305 - 2³ = 205042297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205042307) 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, 525555 + ... + 525944.

It is an arithmetic number, because the mean of its divisors is an integer number (22081500).

Almost surely, 2^205042305 is an apocalyptic number.

It is an amenable number.

205042305 is a deficient number, since it is larger than the sum of its proper divisors (148261695).

205042305 is a wasteful number, since it uses less digits than its factorization.

205042305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051520.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 205042305 is about 14319.2983417485. The cubic root of 205042305 is about 589.6774115115.

Adding to 205042305 its reverse (503240502), we get a palindrome (708282807).

The spelling of 205042305 in words is "two hundred five million, forty-two thousand, three hundred five".