205074890 has 16 divisors (see below), whose sum is σ = 369325440. Its totient is φ = 81987600.

The previous prime is 205074887. The next prime is 205074911. The reversal of 205074890 is 98470502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 205074890.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21491 + ... + 29529.

It is an arithmetic number, because the mean of its divisors is an integer number (23082840).

Almost surely, 2^205074890 is an apocalyptic number.

205074890 is a deficient number, since it is larger than the sum of its proper divisors (164250550).

205074890 is a wasteful number, since it uses less digits than its factorization.

205074890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10597.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 205074890 is about 14320.4360967116. The cubic root of 205074890 is about 589.7086467253.

The spelling of 205074890 in words is "two hundred five million, seventy-four thousand, eight hundred ninety".