204321420 has 96 divisors (see below), whose sum is σ = 663344640. Its totient is φ = 52113600.

The previous prime is 204321367. The next prime is 204321427. The reversal of 204321420 is 24123402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 204321393 and 204321402.

It is not an unprimeable number, because it can be changed into a prime (204321427) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4195 + ... + 20645.

It is an arithmetic number, because the mean of its divisors is an integer number (6909840).

Almost surely, 2^204321420 is an apocalyptic number.

204321420 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 204321420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331672320).

204321420 is an abundant number, since it is smaller than the sum of its proper divisors (459023220).

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

204321420 is a wasteful number, since it uses less digits than its factorization.

204321420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16492 (or 16484 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 204321420 is about 14294.1043790788. The cubic root of 204321420 is about 588.9855400610.

Adding to 204321420 its reverse (24123402), we get a palindrome (228444822).

The spelling of 204321420 in words is "two hundred four million, three hundred twenty-one thousand, four hundred twenty".