205315242 has 16 divisors (see below), whose sum is σ = 447960672. Its totient is φ = 62216720.

The previous prime is 205315241. The next prime is 205315247. The reversal of 205315242 is 242513502.

It is not an unprimeable number, because it can be changed into a prime (205315241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1555353 + ... + 1555484.

It is an arithmetic number, because the mean of its divisors is an integer number (27997542).

Almost surely, 2^205315242 is an apocalyptic number.

205315242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

205315242 is an abundant number, since it is smaller than the sum of its proper divisors (242645430).

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

205315242 is a wasteful number, since it uses less digits than its factorization.

205315242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110853.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 205315242 is about 14328.8255624807. The cubic root of 205315242 is about 589.9389403439.

Adding to 205315242 its reverse (242513502), we get a palindrome (447828744).

The spelling of 205315242 in words is "two hundred five million, three hundred fifteen thousand, two hundred forty-two".