204520123 has 8 divisors (see below), whose sum is σ = 215418320. Its totient is φ = 193635360.

The previous prime is 204520111. The next prime is 204520207. The reversal of 204520123 is 321025402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204520123 - 2⁵ = 204520091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 204520123.

It is not an unprimeable number, because it can be changed into a prime (204520223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48853 + ... + 52873.

It is an arithmetic number, because the mean of its divisors is an integer number (26927290).

Almost surely, 2^204520123 is an apocalyptic number.

204520123 is a deficient number, since it is larger than the sum of its proper divisors (10898197).

204520123 is a wasteful number, since it uses less digits than its factorization.

204520123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6717.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 204520123 is about 14301.0532129630. The cubic root of 204520123 is about 589.1764080831.

Adding to 204520123 its reverse (321025402), we get a palindrome (525545525).

The spelling of 204520123 in words is "two hundred four million, five hundred twenty thousand, one hundred twenty-three".