204264643 has 4 divisors (see below), whose sum is σ = 222834168. Its totient is φ = 185695120.

The previous prime is 204264631. The next prime is 204264647. The reversal of 204264643 is 346462402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204264643 - 2⁹ = 204264131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204264647) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9284746 + ... + 9284767.

It is an arithmetic number, because the mean of its divisors is an integer number (55708542).

Almost surely, 2^204264643 is an apocalyptic number.

204264643 is a deficient number, since it is larger than the sum of its proper divisors (18569525).

204264643 is a wasteful number, since it uses less digits than its factorization.

204264643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18569524.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 204264643 is about 14292.1182124974. The cubic root of 204264643 is about 588.9309790822.

The spelling of 204264643 in words is "two hundred four million, two hundred sixty-four thousand, six hundred forty-three".