320403020240 has 80 divisors (see below), whose sum is σ = 753011804160. Its totient is φ = 126773391360.

The previous prime is 320403020191. The next prime is 320403020303. The reversal of 320403020240 is 42020304023.

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 (20).

It is a congruent number.

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, 16371581 + ... + 16391139.

It is an arithmetic number, because the mean of its divisors is an integer number (9412647552).

Almost surely, 2^320403020240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320403020240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376505902080).

320403020240 is an abundant number, since it is smaller than the sum of its proper divisors (432608783920).

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

320403020240 is a wasteful number, since it uses less digits than its factorization.

320403020240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21780 (or 21774 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 320403020240 its reverse (42020304023), we get a palindrome (362423324263).

The spelling of 320403020240 in words is "three hundred twenty billion, four hundred three million, twenty thousand, two hundred forty".