205240065 has 32 divisors (see below), whose sum is σ = 348935040. Its totient is φ = 102657024.

The previous prime is 205240037. The next prime is 205240067. The reversal of 205240065 is 560042502.

205240065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-205240065 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205240067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79566 + ... + 82104.

It is an arithmetic number, because the mean of its divisors is an integer number (10904220).

Almost surely, 2^205240065 is an apocalyptic number.

It is an amenable number.

205240065 is a deficient number, since it is larger than the sum of its proper divisors (143694975).

205240065 is a wasteful number, since it uses less digits than its factorization.

205240065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 205240065 is about 14326.2020438077. The cubic root of 205240065 is about 589.8669287171.

Adding to 205240065 its reverse (560042502), we get a palindrome (765282567).

The spelling of 205240065 in words is "two hundred five million, two hundred forty thousand, sixty-five".