204240155 has 24 divisors (see below), whose sum is σ = 283219872. Its totient is φ = 138507264.

The previous prime is 204240149. The next prime is 204240181. The reversal of 204240155 is 551042402.

It is a happy number.

204240155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204240155 - 2¹⁰ = 204239131 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 204240155.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 446687 + ... + 447143.

It is an arithmetic number, because the mean of its divisors is an integer number (11800828).

Almost surely, 2^204240155 is an apocalyptic number.

204240155 is a deficient number, since it is larger than the sum of its proper divisors (78979717).

204240155 is an equidigital number, since it uses as much as digits as its factorization.

204240155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 204240155 is about 14291.2614908552. The cubic root of 204240155 is about 588.9074437345.

Adding to 204240155 its reverse (551042402), we get a palindrome (755282557).

The spelling of 204240155 in words is "two hundred four million, two hundred forty thousand, one hundred fifty-five".