204321220 has 24 divisors (see below), whose sum is σ = 438205824. Its totient is φ = 79989216.

The previous prime is 204321191. The next prime is 204321239. The reversal of 204321220 is 22123402.

It is a junction number, because it is equal to n+sod(n) for n = 204321194 and 204321203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107742 + ... + 109621.

It is an arithmetic number, because the mean of its divisors is an integer number (18258576).

Almost surely, 2^204321220 is an apocalyptic number.

204321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204321220 is an abundant number, since it is smaller than the sum of its proper divisors (233884604).

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

204321220 is a wasteful number, since it uses less digits than its factorization.

204321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217419 (or 217417 counting only the distinct ones).

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

The square root of 204321220 is about 14294.0973831858. The cubic root of 204321220 is about 588.9853478848.

Adding to 204321220 its reverse (22123402), we get a palindrome (226444622).

The spelling of 204321220 in words is "two hundred four million, three hundred twenty-one thousand, two hundred twenty".