204431931 has 30 divisors (see below), whose sum is σ = 333845292. Its totient is φ = 123639480.

The previous prime is 204431921. The next prime is 204431939. The reversal of 204431931 is 139134402.

It is not a de Polignac number, because 204431931 - 2⁶ = 204431867 is a prime.

It is a super-2 number, since 2×204431931² = 83584828824777522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 204431895 and 204431904.

It is not an unprimeable number, because it can be changed into a prime (204431939) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 426550 + ... + 427028.

Almost surely, 2^204431931 is an apocalyptic number.

204431931 is a deficient number, since it is larger than the sum of its proper divisors (129413361).

204431931 is an frugal number, since it uses more digits than its factorization.

204431931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 204431931 is about 14297.9694712221. The cubic root of 204431931 is about 589.0917088116.

The spelling of 204431931 in words is "two hundred four million, four hundred thirty-one thousand, nine hundred thirty-one".