205117642 has 8 divisors (see below), whose sum is σ = 307930500. Its totient is φ = 102474144.

The previous prime is 205117639. The next prime is 205117709. The reversal of 205117642 is 246711502.

205117642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 202749121 + 2368521 = 14239^2 + 1539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 205117642.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39267 + ... + 44182.

Almost surely, 2^205117642 is an apocalyptic number.

205117642 is a deficient number, since it is larger than the sum of its proper divisors (102812858).

205117642 is a wasteful number, since it uses less digits than its factorization.

205117642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84680.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 205117642 is about 14321.9287108964. The cubic root of 205117642 is about 589.7496227680.

The spelling of 205117642 in words is "two hundred five million, one hundred seventeen thousand, six hundred forty-two".