204404431 has 24 divisors (see below), whose sum is σ = 262368720. Its totient is φ = 157449600.

The previous prime is 204404429. The next prime is 204404437. The reversal of 204404431 is 134404402.

It is not a de Polignac number, because 204404431 - 2¹ = 204404429 is a prime.

It is a super-2 number, since 2×204404431² = 83562342824867522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204404437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45841 + ... + 50101.

It is an arithmetic number, because the mean of its divisors is an integer number (10932030).

Almost surely, 2^204404431 is an apocalyptic number.

204404431 is a deficient number, since it is larger than the sum of its proper divisors (57964289).

204404431 is a wasteful number, since it uses less digits than its factorization.

204404431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375 (or 4368 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 204404431 is about 14297.0077638644. The cubic root of 204404431 is about 589.0652929310.

Adding to 204404431 its reverse (134404402), we get a palindrome (338808833).

The spelling of 204404431 in words is "two hundred four million, four hundred four thousand, four hundred thirty-one".