204206643 has 32 divisors (see below), whose sum is σ = 308206080. Its totient is φ = 133607520.

The previous prime is 204206593. The next prime is 204206657. The reversal of 204206643 is 346602402.

It is not a de Polignac number, because 204206643 - 2⁹ = 204206131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (204206693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656458 + ... + 656768.

It is an arithmetic number, because the mean of its divisors is an integer number (9631440).

Almost surely, 2^204206643 is an apocalyptic number.

204206643 is a deficient number, since it is larger than the sum of its proper divisors (103999437).

204206643 is a wasteful number, since it uses less digits than its factorization.

204206643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 204206643 is about 14290.0889780295. The cubic root of 204206643 is about 588.8752323969.

The spelling of 204206643 in words is "two hundred four million, two hundred six thousand, six hundred forty-three".