205055042 has 4 divisors (see below), whose sum is σ = 307582566. Its totient is φ = 102527520.

The previous prime is 205055033. The next prime is 205055047. The reversal of 205055042 is 240550502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 119880601 + 85174441 = 10949^2 + 9229^2 .

It is a junction number, because it is equal to n+sod(n) for n = 205054999 and 205055017.

It is not an unprimeable number, because it can be changed into a prime (205055047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51263759 + ... + 51263762.

Almost surely, 2^205055042 is an apocalyptic number.

205055042 is a deficient number, since it is larger than the sum of its proper divisors (102527524).

205055042 is a wasteful number, since it uses less digits than its factorization.

205055042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102527523.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 205055042 is about 14319.7430842875. The cubic root of 205055042 is about 589.6896212937.

The spelling of 205055042 in words is "two hundred five million, fifty-five thousand, forty-two".