204531220 has 48 divisors (see below), whose sum is σ = 443963520. Its totient is φ = 79099776.

The previous prime is 204531209. The next prime is 204531241. The reversal of 204531220 is 22135402.

204531220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 87426 + ... + 89734.

It is an arithmetic number, because the mean of its divisors is an integer number (9249240).

Almost surely, 2^204531220 is an apocalyptic number.

204531220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204531220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221981760).

204531220 is an abundant number, since it is smaller than the sum of its proper divisors (239432300).

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

204531220 is a wasteful number, since it uses less digits than its factorization.

204531220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464 (or 2462 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 204531220 is about 14301.4411861183. The cubic root of 204531220 is about 589.1870638762.

Adding to 204531220 its reverse (22135402), we get a palindrome (226666622).

The spelling of 204531220 in words is "two hundred four million, five hundred thirty-one thousand, two hundred twenty".