204040431 has 32 divisors (see below), whose sum is σ = 346168320. Its totient is φ = 116357472.

The previous prime is 204040427. The next prime is 204040457. The reversal of 204040431 is 134040402.

It is not a de Polignac number, because 204040431 - 2² = 204040427 is a prime.

It is a super-2 number, since 2×204040431² = 83264994965331522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204040931) 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, 139701 + ... + 141153.

It is an arithmetic number, because the mean of its divisors is an integer number (10817760).

Almost surely, 2^204040431 is an apocalyptic number.

204040431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

204040431 is a deficient number, since it is larger than the sum of its proper divisors (142127889).

204040431 is a wasteful number, since it uses less digits than its factorization.

204040431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212 (or 2206 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 204040431 is about 14284.2721550662. The cubic root of 204040431 is about 588.7154192842.

Adding to 204040431 its reverse (134040402), we get a palindrome (338080833).

The spelling of 204040431 in words is "two hundred four million, forty thousand, four hundred thirty-one".