204342543 has 6 divisors (see below), whose sum is σ = 295161464. Its totient is φ = 136228356.

The previous prime is 204342521. The next prime is 204342569. The reversal of 204342543 is 345243402.

It is not a de Polignac number, because 204342543 - 2¹⁰ = 204341519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204342343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11352355 + ... + 11352372.

Almost surely, 2^204342543 is an apocalyptic number.

204342543 is a deficient number, since it is larger than the sum of its proper divisors (90818921).

204342543 is a wasteful number, since it uses less digits than its factorization.

204342543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22704733 (or 22704730 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

The square root of 204342543 is about 14294.8432310396. The cubic root of 204342543 is about 589.0058360451.

Adding to 204342543 its reverse (345243402), we get a palindrome (549585945).

The spelling of 204342543 in words is "two hundred four million, three hundred forty-two thousand, five hundred forty-three".