320441220 has 72 divisors (see below), whose sum is σ = 1060375680. Its totient is φ = 77682240.

The previous prime is 320441179. The next prime is 320441227. The reversal of 320441220 is 22144023.

320441220 is a `hidden beast` number, since 3 + 2 + 0 + 441 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 320441193 and 320441202.

It is not an unprimeable number, because it can be changed into a prime (320441227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78940 + ... + 82899.

It is an arithmetic number, because the mean of its divisors is an integer number (14727440).

Almost surely, 2^320441220 is an apocalyptic number.

320441220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320441220 is an abundant number, since it is smaller than the sum of its proper divisors (739934460).

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

320441220 is a wasteful number, since it uses less digits than its factorization.

320441220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161865 (or 161860 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 320441220 is about 17900.8720457971. The cubic root of 320441220 is about 684.3045991259.

Adding to 320441220 its reverse (22144023), we get a palindrome (342585243).

The spelling of 320441220 in words is "three hundred twenty million, four hundred forty-one thousand, two hundred twenty".