204405220 has 12 divisors (see below), whose sum is σ = 429251004. Its totient is φ = 81762080.

The previous prime is 204405217. The next prime is 204405239. The reversal of 204405220 is 22504402.

It can be written as a sum of positive squares in 2 ways, for example, as 36650916 + 167754304 = 6054^2 + 12952^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5110111 + ... + 5110150.

It is an arithmetic number, because the mean of its divisors is an integer number (35770917).

Almost surely, 2^204405220 is an apocalyptic number.

204405220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204405220 is an abundant number, since it is smaller than the sum of its proper divisors (224845784).

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

204405220 is a wasteful number, since it uses less digits than its factorization.

204405220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10220270 (or 10220268 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 204405220 is about 14297.0353570242. The cubic root of 204405220 is about 589.0660508596.

Adding to 204405220 its reverse (22504402), we get a palindrome (226909622).

The spelling of 204405220 in words is "two hundred four million, four hundred five thousand, two hundred twenty".