320420220 has 48 divisors (see below), whose sum is σ = 902391840. Its totient is φ = 84948736.

The previous prime is 320420213. The next prime is 320420239. The reversal of 320420220 is 22024023.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 320420220.

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, 5055 + ... + 25814.

It is an arithmetic number, because the mean of its divisors is an integer number (18799830).

Almost surely, 2^320420220 is an apocalyptic number.

320420220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320420220 is an abundant number, since it is smaller than the sum of its proper divisors (581971620).

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

320420220 is a wasteful number, since it uses less digits than its factorization.

320420220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31054 (or 31052 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 320420220 is about 17900.2854725839. The cubic root of 320420220 is about 684.2896502474.

Adding to 320420220 its reverse (22024023), we get a palindrome (342444243).

The spelling of 320420220 in words is "three hundred twenty million, four hundred twenty thousand, two hundred twenty".