323431220 has 24 divisors (see below), whose sum is σ = 776235264. Its totient is φ = 110890656.

The previous prime is 323431219. The next prime is 323431223. The reversal of 323431220 is 22134323.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 323431192 and 323431201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323431223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154972 + ... + 1155251.

It is an arithmetic number, because the mean of its divisors is an integer number (32343136).

Almost surely, 2^323431220 is an apocalyptic number.

It is an amenable number.

323431220 is an abundant number, since it is smaller than the sum of its proper divisors (452804044).

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

323431220 is a wasteful number, since it uses less digits than its factorization.

323431220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310239 (or 2310237 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 323431220 is about 17984.1936155058. The cubic root of 323431220 is about 686.4264023628.

Adding to 323431220 its reverse (22134323), we get a palindrome (345565543).

The spelling of 323431220 in words is "three hundred twenty-three million, four hundred thirty-one thousand, two hundred twenty".