320420423440 has 160 divisors (see below), whose sum is σ = 814519867392. Its totient is φ = 116517120000.

The previous prime is 320420423431. The next prime is 320420423441. The reversal of 320420423440 is 44324024023.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 320420423399 and 320420423408.

It is not an unprimeable number, because it can be changed into a prime (320420423441) 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 31 ways as a sum of consecutive naturals, for example, 20054655 + ... + 20070625.

Almost surely, 2^320420423440 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 320420423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407259933696).

320420423440 is an abundant number, since it is smaller than the sum of its proper divisors (494099443952).

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

320420423440 is a wasteful number, since it uses less digits than its factorization.

320420423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16289 (or 16283 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 320420423440 its reverse (44324024023), we get a palindrome (364744447463).

The spelling of 320420423440 in words is "three hundred twenty billion, four hundred twenty million, four hundred twenty-three thousand, four hundred forty".