320500403120 has 80 divisors (see below), whose sum is σ = 756571076352. Its totient is φ = 126247514880.

The previous prime is 320500403117. The next prime is 320500403221. The reversal of 320500403120 is 21304005023.

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 (20).

It is a junction number, because it is equal to n+sod(n) for n = 320500403092 and 320500403101.

It is an unprimeable number.

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, 1987439 + ... + 2142641.

Almost surely, 2^320500403120 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 320500403120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378285538176).

320500403120 is an abundant number, since it is smaller than the sum of its proper divisors (436070673232).

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

320500403120 is a wasteful number, since it uses less digits than its factorization.

320500403120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155610 (or 155604 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 320500403120 its reverse (21304005023), we get a palindrome (341804408143).

The spelling of 320500403120 in words is "three hundred twenty billion, five hundred million, four hundred three thousand, one hundred twenty".