320231220 has 48 divisors (see below), whose sum is σ = 897619968. Its totient is φ = 85302400.

The previous prime is 320231213. The next prime is 320231221. The reversal of 320231220 is 22132023.

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 320231220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320231221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66742 + ... + 71378.

It is an arithmetic number, because the mean of its divisors is an integer number (18700416).

Almost surely, 2^320231220 is an apocalyptic number.

320231220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320231220 is an abundant number, since it is smaller than the sum of its proper divisors (577388748).

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

320231220 is a wasteful number, since it uses less digits than its factorization.

320231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800 (or 5798 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 320231220 is about 17895.0054484485. The cubic root of 320231220 is about 684.1550809405.

Adding to 320231220 its reverse (22132023), we get a palindrome (342363243).

It can be divided in two parts, 320 and 231220, that added together give a triangular number (231540 = T₆₈₀).

The spelling of 320231220 in words is "three hundred twenty million, two hundred thirty-one thousand, two hundred twenty".