205034645 has 16 divisors (see below), whose sum is σ = 253371888. Its totient is φ = 159183360.

The previous prime is 205034639. The next prime is 205034647. The reversal of 205034645 is 546430502.

It can be written as a sum of positive squares in 8 ways, for example, as 15311569 + 189723076 = 3913^2 + 13774^2 .

It is not a de Polignac number, because 205034645 - 2¹⁸ = 204772501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205034647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37847 + ... + 42923.

It is an arithmetic number, because the mean of its divisors is an integer number (15835743).

Almost surely, 2^205034645 is an apocalyptic number.

It is an amenable number.

205034645 is a deficient number, since it is larger than the sum of its proper divisors (48337243).

205034645 is a wasteful number, since it uses less digits than its factorization.

205034645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 205034645 is about 14319.0308680441. The cubic root of 205034645 is about 589.6700683355.

The spelling of 205034645 in words is "two hundred five million, thirty-four thousand, six hundred forty-five".