205120042 has 8 divisors (see below), whose sum is σ = 308228256. Its totient is φ = 102377292.

The previous prime is 205120037. The next prime is 205120043. The reversal of 205120042 is 240021502.

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

It is a junction number, because it is equal to n+sod(n) for n = 205119998 and 205120025.

It is not an unprimeable number, because it can be changed into a prime (205120043) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 89958 + ... + 92209.

It is an arithmetic number, because the mean of its divisors is an integer number (38528532).

Almost surely, 2^205120042 is an apocalyptic number.

205120042 is a deficient number, since it is larger than the sum of its proper divisors (103108214).

205120042 is a wasteful number, since it uses less digits than its factorization.

205120042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182732.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 205120042 is about 14322.0124982490. The cubic root of 205120042 is about 589.7519229010.

Adding to 205120042 its reverse (240021502), we get a palindrome (445141544).

The spelling of 205120042 in words is "two hundred five million, one hundred twenty thousand, forty-two".