204423220 has 24 divisors (see below), whose sum is σ = 429572808. Its totient is φ = 81715200.

The previous prime is 204423217. The next prime is 204423221. The reversal of 204423220 is 22324402.

It can be written as a sum of positive squares in 4 ways, for example, as 51208336 + 153214884 = 7156^2 + 12378^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204423221) by changing a digit.

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, 43380 + ... + 47860.

It is an arithmetic number, because the mean of its divisors is an integer number (17898867).

Almost surely, 2^204423220 is an apocalyptic number.

204423220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204423220 is an abundant number, since it is smaller than the sum of its proper divisors (225149588).

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

204423220 is a wasteful number, since it uses less digits than its factorization.

204423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6771 (or 6769 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 204423220 is about 14297.6648443024. The cubic root of 204423220 is about 589.0833414775.

Adding to 204423220 its reverse (22324402), we get a palindrome (226747622).

The spelling of 204423220 in words is "two hundred four million, four hundred twenty-three thousand, two hundred twenty".