205043645 has 8 divisors (see below), whose sum is σ = 248441856. Its totient is φ = 162441936.

The previous prime is 205043639. The next prime is 205043693. The reversal of 205043645 is 546340502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205043645 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 198557 + ... + 199586.

It is an arithmetic number, because the mean of its divisors is an integer number (31055232).

Almost surely, 2^205043645 is an apocalyptic number.

It is an amenable number.

205043645 is a deficient number, since it is larger than the sum of its proper divisors (43398211).

205043645 is a wasteful number, since it uses less digits than its factorization.

205043645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398251.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 205043645 is about 14319.3451316741. The cubic root of 205043645 is about 589.6786960692.

The spelling of 205043645 in words is "two hundred five million, forty-three thousand, six hundred forty-five".