204243440 has 80 divisors (see below), whose sum is σ = 509431680. Its totient is φ = 75878400.

The previous prime is 204243439. The next prime is 204243443. The reversal of 204243440 is 44342402.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204243443) 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 15 ways as a sum of consecutive naturals, for example, 106490 + ... + 108390.

It is an arithmetic number, because the mean of its divisors is an integer number (6367896).

Almost surely, 2^204243440 is an apocalyptic number.

204243440 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 204243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254715840).

204243440 is an abundant number, since it is smaller than the sum of its proper divisors (305188240).

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

204243440 is a wasteful number, since it uses less digits than its factorization.

204243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 23.

The square root of 204243440 is about 14291.3764207651. The cubic root of 204243440 is about 588.9106010480.

Adding to 204243440 its reverse (44342402), we get a palindrome (248585842).

The spelling of 204243440 in words is "two hundred four million, two hundred forty-three thousand, four hundred forty".