204420643 has 4 divisors (see below), whose sum is σ = 233623600. Its totient is φ = 175217688.

The previous prime is 204420589. The next prime is 204420649. The reversal of 204420643 is 346024402.

204420643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346024402 = 2 ⋅173012201.

It is a cyclic number.

It is not a de Polignac number, because 204420643 - 2¹⁷ = 204289571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204420649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14601468 + ... + 14601481.

It is an arithmetic number, because the mean of its divisors is an integer number (58405900).

Almost surely, 2^204420643 is an apocalyptic number.

204420643 is a deficient number, since it is larger than the sum of its proper divisors (29202957).

204420643 is an equidigital number, since it uses as much as digits as its factorization.

204420643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29202956.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 204420643 is about 14297.5747244069. The cubic root of 204420643 is about 589.0808660997.

The spelling of 204420643 in words is "two hundred four million, four hundred twenty thousand, six hundred forty-three".