320856420 has 96 divisors (see below), whose sum is σ = 957358080. Its totient is φ = 80058240.

The previous prime is 320856409. The next prime is 320856421. The reversal of 320856420 is 24658023.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (320856421) 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, 92925 + ... + 96315.

It is an arithmetic number, because the mean of its divisors is an integer number (9972480).

Almost surely, 2^320856420 is an apocalyptic number.

320856420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320856420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (478679040).

320856420 is an abundant number, since it is smaller than the sum of its proper divisors (636501660).

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

320856420 is a wasteful number, since it uses less digits than its factorization.

320856420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505 (or 3503 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 320856420 is about 17912.4654919416. The cubic root of 320856420 is about 684.6000257917.

The spelling of 320856420 in words is "three hundred twenty million, eight hundred fifty-six thousand, four hundred twenty".