205317642 has 16 divisors (see below), whose sum is σ = 428489280. Its totient is φ = 65463552.

The previous prime is 205317631. The next prime is 205317659. The reversal of 205317642 is 246713502.

205317642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 743767 + ... + 744042.

It is an arithmetic number, because the mean of its divisors is an integer number (26780580).

Almost surely, 2^205317642 is an apocalyptic number.

205317642 is an abundant number, since it is smaller than the sum of its proper divisors (223171638).

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

205317642 is a wasteful number, since it uses less digits than its factorization.

205317642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487837.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 205317642 is about 14328.9093095043. The cubic root of 205317642 is about 589.9412390009.

The spelling of 205317642 in words is "two hundred five million, three hundred seventeen thousand, six hundred forty-two".