204040155 has 32 divisors (see below), whose sum is σ = 361179648. Its totient is φ = 97529600.

The previous prime is 204040129. The next prime is 204040217. The reversal of 204040155 is 551040402.

It is not a de Polignac number, because 204040155 - 2¹⁰ = 204039131 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3007 + ... + 20423.

It is an arithmetic number, because the mean of its divisors is an integer number (11286864).

Almost surely, 2^204040155 is an apocalyptic number.

204040155 is a deficient number, since it is larger than the sum of its proper divisors (157139493).

204040155 is a wasteful number, since it uses less digits than its factorization.

204040155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17507.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 204040155 is about 14284.2624940877. The cubic root of 204040155 is about 588.7151538376.

Adding to 204040155 its reverse (551040402), we get a palindrome (755080557).

It can be divided in two parts, 2040 and 40155, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 204040155 in words is "two hundred four million, forty thousand, one hundred fifty-five".