205220205 has 24 divisors (see below), whose sum is σ = 359718840. Its totient is φ = 108218880.

The previous prime is 205220203. The next prime is 205220207. The reversal of 205220205 is 502022502.

It is an interprime number because it is at equal distance from previous prime (205220203) and next prime (205220207).

It can be written as a sum of positive squares in 4 ways, for example, as 2499561 + 202720644 = 1581^2 + 14238^2 .

It is not a de Polignac number, because 205220205 - 2¹ = 205220203 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205220203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21616 + ... + 29625.

It is an arithmetic number, because the mean of its divisors is an integer number (14988285).

Almost surely, 2^205220205 is an apocalyptic number.

It is an amenable number.

205220205 is a deficient number, since it is larger than the sum of its proper divisors (154498635).

205220205 is a wasteful number, since it uses less digits than its factorization.

205220205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51341 (or 51338 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 205220205 is about 14325.5088914844. The cubic root of 205220205 is about 589.8479019982.

Adding to 205220205 its reverse (502022502), we get a palindrome (707242707).

It can be divided in two parts, 20 and 5220205, that added together give a palindrome (5220225).

The spelling of 205220205 in words is "two hundred five million, two hundred twenty thousand, two hundred five".