1204220205 has 12 divisors (see below), whose sum is σ = 2087315100. Its totient is φ = 642250752.

The previous prime is 1204220189. The next prime is 1204220231. The reversal of 1204220205 is 5020224021.

It can be written as a sum of positive squares in 2 ways, for example, as 271162089 + 933058116 = 16467^2 + 30546^2 .

It is not a de Polignac number, because 1204220205 - 2⁴ = 1204220189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13380180 + ... + 13380269.

It is an arithmetic number, because the mean of its divisors is an integer number (173942925).

Almost surely, 2^1204220205 is an apocalyptic number.

1204220205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1204220205 is a deficient number, since it is larger than the sum of its proper divisors (883094895).

1204220205 is a wasteful number, since it uses less digits than its factorization.

1204220205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26760460 (or 26760457 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1204220205 is about 34701.8761020208. The cubic root of 1204220205 is about 1063.9028441848.

Adding to 1204220205 its reverse (5020224021), we get a palindrome (6224444226).

The spelling of 1204220205 in words is "one billion, two hundred four million, two hundred twenty thousand, two hundred five".