204111305 has 4 divisors (see below), whose sum is σ = 244933572. Its totient is φ = 163289040.

The previous prime is 204111301. The next prime is 204111317. The reversal of 204111305 is 503111402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 83375161 + 120736144 = 9131^2 + 10988^2 .

It is not a de Polignac number, because 204111305 - 2² = 204111301 is a prime.

It is a super-2 number, since 2×204111305² = 83322849657606050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204111301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20411126 + ... + 20411135.

It is an arithmetic number, because the mean of its divisors is an integer number (61233393).

Almost surely, 2^204111305 is an apocalyptic number.

It is an amenable number.

204111305 is a deficient number, since it is larger than the sum of its proper divisors (40822267).

204111305 is an equidigital number, since it uses as much as digits as its factorization.

204111305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40822266.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 204111305 is about 14286.7527801107. The cubic root of 204111305 is about 588.7835753620.

Adding to 204111305 its reverse (503111402), we get a palindrome (707222707).

The spelling of 204111305 in words is "two hundred four million, one hundred eleven thousand, three hundred five".