204313243440 has 80 divisors (see below), whose sum is σ = 648819160416. Its totient is φ = 53154662400.

The previous prime is 204313243439. The next prime is 204313243447. The reversal of 204313243440 is 44342313402.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 204313243398 and 204313243407.

It is not an unprimeable number, because it can be changed into a prime (204313243447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10371931 + ... + 10391610.

Almost surely, 2^204313243440 is an apocalyptic number.

204313243440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204313243440 is an abundant number, since it is smaller than the sum of its proper divisors (444505916976).

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

204313243440 is a wasteful number, since it uses less digits than its factorization.

204313243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20763598 (or 20763592 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 204313243440 its reverse (44342313402), we get a palindrome (248655556842).

The spelling of 204313243440 in words is "two hundred four billion, three hundred thirteen million, two hundred forty-three thousand, four hundred forty".