204205420 has 48 divisors (see below), whose sum is σ = 442876896. Its totient is φ = 79040000.

The previous prime is 204205381. The next prime is 204205433. The reversal of 204205420 is 24502402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106470 + ... + 108370.

It is an arithmetic number, because the mean of its divisors is an integer number (9226602).

Almost surely, 2^204205420 is an apocalyptic number.

204205420 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 204205420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221438448).

204205420 is an abundant number, since it is smaller than the sum of its proper divisors (238671476).

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

204205420 is a wasteful number, since it uses less digits than its factorization.

204205420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082 (or 2080 counting only the distinct ones).

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

The square root of 204205420 is about 14290.0461860695. The cubic root of 204205420 is about 588.8740567972.

Adding to 204205420 its reverse (24502402), we get a palindrome (228707822).

The spelling of 204205420 in words is "two hundred four million, two hundred five thousand, four hundred twenty".