205304155 has 24 divisors (see below), whose sum is σ = 299111328. Its totient is φ = 132492288.

The previous prime is 205304153. The next prime is 205304159. The reversal of 205304155 is 551403502.

It is not a de Polignac number, because 205304155 - 2¹ = 205304153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205304153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34 + ... + 20263.

It is an arithmetic number, because the mean of its divisors is an integer number (12462972).

Almost surely, 2^205304155 is an apocalyptic number.

205304155 is a deficient number, since it is larger than the sum of its proper divisors (93807173).

205304155 is a wasteful number, since it uses less digits than its factorization.

205304155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20343 (or 20326 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 205304155 is about 14328.4386797725. The cubic root of 205304155 is about 589.9283212740.

Adding to 205304155 its reverse (551403502), we get a palindrome (756707657).

The spelling of 205304155 in words is "two hundred five million, three hundred four thousand, one hundred fifty-five".