204321040 has 160 divisors (see below), whose sum is σ = 607461120. Its totient is φ = 62054400.

The previous prime is 204320971. The next prime is 204321043. The reversal of 204321040 is 40123402.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (204321043) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 252156 + ... + 252964.

It is an arithmetic number, because the mean of its divisors is an integer number (3796632).

Almost surely, 2^204321040 is an apocalyptic number.

204321040 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 204321040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303730560).

204321040 is an abundant number, since it is smaller than the sum of its proper divisors (403140080).

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

204321040 is a wasteful number, since it uses less digits than its factorization.

204321040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 204321040 is about 14294.0910868792. The cubic root of 204321040 is about 588.9851749261.

Adding to 204321040 its reverse (40123402), we get a palindrome (244444442).

The spelling of 204321040 in words is "two hundred four million, three hundred twenty-one thousand, forty".