205205345 has 4 divisors (see below), whose sum is σ = 246246420. Its totient is φ = 164164272.

The previous prime is 205205323. The next prime is 205205383. The reversal of 205205345 is 543502502.

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 91164304 + 114041041 = 9548^2 + 10679^2 .

It is a cyclic number.

It is not a de Polignac number, because 205205345 - 2²⁴ = 188428129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20520530 + ... + 20520539.

It is an arithmetic number, because the mean of its divisors is an integer number (61561605).

Almost surely, 2^205205345 is an apocalyptic number.

It is an amenable number.

205205345 is a deficient number, since it is larger than the sum of its proper divisors (41041075).

205205345 is an equidigital number, since it uses as much as digits as its factorization.

205205345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41041074.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 205205345 is about 14324.9902268728. The cubic root of 205205345 is about 589.8336646876.

Adding to 205205345 its reverse (543502502), we get a palindrome (748707847).

The spelling of 205205345 in words is "two hundred five million, two hundred five thousand, three hundred forty-five".