205028240 has 40 divisors (see below), whose sum is σ = 501783360. Its totient is φ = 77694336.

The previous prime is 205028227. The next prime is 205028261. The reversal of 205028240 is 42820502.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65924 + ... + 68963.

It is an arithmetic number, because the mean of its divisors is an integer number (12544584).

Almost surely, 2^205028240 is an apocalyptic number.

205028240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205028240 is an abundant number, since it is smaller than the sum of its proper divisors (296755120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205028240 is a wasteful number, since it uses less digits than its factorization.

205028240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134919 (or 134913 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 205028240 is about 14318.8072128931. The cubic root of 205028240 is about 589.6639281112.

Adding to 205028240 its reverse (42820502), we get a palindrome (247848742).

The spelling of 205028240 in words is "two hundred five million, twenty-eight thousand, two hundred forty".