204231220 has 24 divisors (see below), whose sum is σ = 429617664. Its totient is φ = 81553056.

The previous prime is 204231187. The next prime is 204231239. The reversal of 204231220 is 22132402.

It is a junction number, because it is equal to n+sod(n) for n = 204231194 and 204231203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3729 + ... + 20551.

It is an arithmetic number, because the mean of its divisors is an integer number (17900736).

Almost surely, 2^204231220 is an apocalyptic number.

204231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204231220 is an abundant number, since it is smaller than the sum of its proper divisors (225386444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204231220 is a wasteful number, since it uses less digits than its factorization.

204231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17439 (or 17437 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 204231220 is about 14290.9488838215. The cubic root of 204231220 is about 588.8988558628.

Adding to 204231220 its reverse (22132402), we get a palindrome (226363622).

The spelling of 204231220 in words is "two hundred four million, two hundred thirty-one thousand, two hundred twenty".