205434790 has 32 divisors (see below), whose sum is σ = 404520480. Its totient is φ = 74496000.

The previous prime is 205434787. The next prime is 205434829. The reversal of 205434790 is 97434502.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 40390 + ... + 45190.

It is an arithmetic number, because the mean of its divisors is an integer number (12641265).

Almost surely, 2^205434790 is an apocalyptic number.

205434790 is a deficient number, since it is larger than the sum of its proper divisors (199085690).

205434790 is a wasteful number, since it uses less digits than its factorization.

205434790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5208.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 205434790 is about 14332.9965464309. The cubic root of 205434790 is about 590.0534185091.

The spelling of 205434790 in words is "two hundred five million, four hundred thirty-four thousand, seven hundred ninety".