205042040 has 32 divisors (see below), whose sum is σ = 527251680. Its totient is φ = 70300032.

The previous prime is 205042039. The next prime is 205042069. The reversal of 205042040 is 40240502.

It is a congruent number.

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, 365867 + ... + 366426.

It is an arithmetic number, because the mean of its divisors is an integer number (16476615).

Almost surely, 2^205042040 is an apocalyptic number.

205042040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205042040 is an abundant number, since it is smaller than the sum of its proper divisors (322209640).

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

205042040 is a wasteful number, since it uses less digits than its factorization.

205042040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732311 (or 732307 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 205042040 is about 14319.2890884988. The cubic root of 205042040 is about 589.6771574752.

Adding to 205042040 its reverse (40240502), we get a palindrome (245282542).

The spelling of 205042040 in words is "two hundred five million, forty-two thousand, forty".