320004478220 has 96 divisors (see below), whose sum is σ = 795511342080. Its totient is φ = 105796857600.

The previous prime is 320004478201. The next prime is 320004478223. The reversal of 320004478220 is 22874400023.

It is not an unprimeable number, because it can be changed into a prime (320004478223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3145145 + ... + 3245295.

It is an arithmetic number, because the mean of its divisors is an integer number (8286576480).

Almost surely, 2^320004478220 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 320004478220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (397755671040).

320004478220 is an abundant number, since it is smaller than the sum of its proper divisors (475506863860).

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

320004478220 is a wasteful number, since it uses less digits than its factorization.

320004478220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100983 (or 100981 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

Adding to 320004478220 its reverse (22874400023), we get a palindrome (342878878243).

The spelling of 320004478220 in words is "three hundred twenty billion, four million, four hundred seventy-eight thousand, two hundred twenty".