204240505 has 32 divisors (see below), whose sum is σ = 286553088. Its totient is φ = 136857600.

The previous prime is 204240503. The next prime is 204240523. The reversal of 204240505 is 505042402.

It is not a de Polignac number, because 204240505 - 2¹ = 204240503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204240503) 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, 578409 + ... + 578761.

It is an arithmetic number, because the mean of its divisors is an integer number (8954784).

Almost surely, 2^204240505 is an apocalyptic number.

It is an amenable number.

204240505 is a deficient number, since it is larger than the sum of its proper divisors (82312583).

204240505 is a wasteful number, since it uses less digits than its factorization.

204240505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 204240505 is about 14291.2737360950. The cubic root of 204240505 is about 588.9077801318.

Adding to 204240505 its reverse (505042402), we get a palindrome (709282907).

The spelling of 204240505 in words is "two hundred four million, two hundred forty thousand, five hundred five".