204434431 has 4 divisors (see below), whose sum is σ = 204464664. Its totient is φ = 204404200.

The previous prime is 204434411. The next prime is 204434497. The reversal of 204434431 is 134434402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 204434431 - 2⁹ = 204433919 is a prime.

It is a super-2 number, since 2×204434431² = 83586873156587522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204434396 and 204434405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204434411) 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, 201 + ... + 20221.

It is an arithmetic number, because the mean of its divisors is an integer number (51116166).

Almost surely, 2^204434431 is an apocalyptic number.

204434431 is a deficient number, since it is larger than the sum of its proper divisors (30233).

204434431 is a wasteful number, since it uses less digits than its factorization.

204434431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30232.

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

The square root of 204434431 is about 14298.0568959562. The cubic root of 204434431 is about 589.0941101378.

Adding to 204434431 its reverse (134434402), we get a palindrome (338868833).

The spelling of 204434431 in words is "two hundred four million, four hundred thirty-four thousand, four hundred thirty-one".