320220331 has 4 divisors (see below), whose sum is σ = 320985000. Its totient is φ = 319455664.

The previous prime is 320220301. The next prime is 320220343. The reversal of 320220331 is 133022023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133022023 = 31 ⋅4291033.

It is a cyclic number.

It is not a de Polignac number, because 320220331 - 2⁷ = 320220203 is a prime.

It is a super-2 number, since 2×320220331² = 205082120771499122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320220301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381706 + ... + 382543.

It is an arithmetic number, because the mean of its divisors is an integer number (80246250).

Almost surely, 2^320220331 is an apocalyptic number.

320220331 is a deficient number, since it is larger than the sum of its proper divisors (764669).

320220331 is an equidigital number, since it uses as much as digits as its factorization.

320220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764668.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 320220331 is about 17894.7011989583. The cubic root of 320220331 is about 684.1473262842.

Adding to 320220331 its reverse (133022023), we get a palindrome (453242354).

The spelling of 320220331 in words is "three hundred twenty million, two hundred twenty thousand, three hundred thirty-one".