205245 has 12 divisors (see below), whose sum is σ = 355836. Its totient is φ = 109440.

The previous prime is 205237. The next prime is 205253. The reversal of 205245 is 542502.

It is an interprime number because it is at equal distance from previous prime (205237) and next prime (205253).

It can be written as a sum of positive squares in 2 ways, for example, as 71289 + 133956 = 267^2 + 366^2 .

It is not a de Polignac number, because 205245 - 2³ = 205237 is a prime.

It is a Curzon number.

205245 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2236 + ... + 2325.

It is an arithmetic number, because the mean of its divisors is an integer number (29653).

2²⁰⁵²⁴⁵ is an apocalyptic number.

It is an amenable number.

205245 is a deficient number, since it is larger than the sum of its proper divisors (150591).

205245 is a wasteful number, since it uses less digits than its factorization.

205245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572 (or 4569 counting only the distinct ones).

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

The square root of 205245 is about 453.0397333568. The cubic root of 205245 is about 58.9871656465.

Adding to 205245 its reverse (542502), we get a palindrome (747747).

The spelling of 205245 in words is "two hundred five thousand, two hundred forty-five".