205240040 has 32 divisors (see below), whose sum is σ = 481870080. Its totient is φ = 78526272.

The previous prime is 205240037. The next prime is 205240067. The reversal of 205240040 is 40042502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110624 + ... + 112463.

It is an arithmetic number, because the mean of its divisors is an integer number (15058440).

Almost surely, 2^205240040 is an apocalyptic number.

205240040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205240040 is an abundant number, since it is smaller than the sum of its proper divisors (276630040).

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

205240040 is a wasteful number, since it uses less digits than its factorization.

205240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223121 (or 223117 counting only the distinct ones).

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

The square root of 205240040 is about 14326.2011712805. The cubic root of 205240040 is about 589.8669047668.

Adding to 205240040 its reverse (40042502), we get a palindrome (245282542).

The spelling of 205240040 in words is "two hundred five million, two hundred forty thousand, forty".