323161220 has 12 divisors (see below), whose sum is σ = 678638604. Its totient is φ = 129264480.

The previous prime is 323161207. The next prime is 323161243. The reversal of 323161220 is 22161323.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77862976 + 245298244 = 8824^2 + 15662^2 .

It is a super-2 number, since 2×323161220² = 208866348223776800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 16158061 = 323161220 / (3 + 2 + 3 + 1 + 6 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 323161192 and 323161201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8079011 + ... + 8079050.

It is an arithmetic number, because the mean of its divisors is an integer number (56553217).

Almost surely, 2^323161220 is an apocalyptic number.

It is an amenable number.

323161220 is an abundant number, since it is smaller than the sum of its proper divisors (355477384).

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

323161220 is a wasteful number, since it uses less digits than its factorization.

323161220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16158070 (or 16158068 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 323161220 is about 17976.6854564461. The cubic root of 323161220 is about 686.2353398704.

The spelling of 323161220 in words is "three hundred twenty-three million, one hundred sixty-one thousand, two hundred twenty".