205502042 has 4 divisors (see below), whose sum is σ = 308253066. Its totient is φ = 102751020.

The previous prime is 205502027. The next prime is 205502051. The reversal of 205502042 is 240205502.

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., 203034001 + 2468041 = 14249^2 + 1571^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51375509 + ... + 51375512.

Almost surely, 2^205502042 is an apocalyptic number.

205502042 is a deficient number, since it is larger than the sum of its proper divisors (102751024).

205502042 is a wasteful number, since it uses less digits than its factorization.

205502042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102751023.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 205502042 is about 14335.3424095834. The cubic root of 205502042 is about 590.1177989436.

Adding to 205502042 its reverse (240205502), we get a palindrome (445707544).

The spelling of 205502042 in words is "two hundred five million, five hundred two thousand, forty-two".