205603642 has 8 divisors (see below), whose sum is σ = 314224596. Its totient is φ = 100862112.

The previous prime is 205603639. The next prime is 205603663. The reversal of 205603642 is 246306502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 194574601 + 11029041 = 13949^2 + 3321^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 205603642.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 969723 + ... + 969934.

Almost surely, 2^205603642 is an apocalyptic number.

205603642 is a deficient number, since it is larger than the sum of its proper divisors (108620954).

205603642 is a wasteful number, since it uses less digits than its factorization.

205603642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939712.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 205603642 is about 14338.8856610268. The cubic root of 205603642 is about 590.2150341337.

The spelling of 205603642 in words is "two hundred five million, six hundred three thousand, six hundred forty-two".