204187220 has 48 divisors (see below), whose sum is σ = 441080640. Its totient is φ = 79355136.

The previous prime is 204187199. The next prime is 204187237. The reversal of 204187220 is 22781402.

It is a super-2 number, since 2×204187220² = 83384841622656800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204187220.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 199871 + ... + 200889.

It is an arithmetic number, because the mean of its divisors is an integer number (9189180).

Almost surely, 2^204187220 is an apocalyptic number.

204187220 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 204187220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220540320).

204187220 is an abundant number, since it is smaller than the sum of its proper divisors (236893420).

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

204187220 is a wasteful number, since it uses less digits than its factorization.

204187220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 204187220 is about 14289.4093649808. The cubic root of 204187220 is about 588.8565616261.

The spelling of 204187220 in words is "two hundred four million, one hundred eighty-seven thousand, two hundred twenty".