204423155 has 4 divisors (see below), whose sum is σ = 245307792. Its totient is φ = 163538520.

The previous prime is 204423151. The next prime is 204423169. The reversal of 204423155 is 551324402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 204423155 - 2² = 204423151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204423151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20442311 + ... + 20442320.

It is an arithmetic number, because the mean of its divisors is an integer number (61326948).

Almost surely, 2^204423155 is an apocalyptic number.

204423155 is a deficient number, since it is larger than the sum of its proper divisors (40884637).

204423155 is an equidigital number, since it uses as much as digits as its factorization.

204423155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40884636.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 204423155 is about 14297.6625712037. The cubic root of 204423155 is about 589.0832790410.

Adding to 204423155 its reverse (551324402), we get a palindrome (755747557).

The spelling of 204423155 in words is "two hundred four million, four hundred twenty-three thousand, one hundred fifty-five".