320406220220 has 12 divisors (see below), whose sum is σ = 672853062504. Its totient is φ = 128162488080.

The previous prime is 320406220217. The next prime is 320406220241. The reversal of 320406220220 is 22022604023.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 8010155486 + ... + 8010155525.

It is an arithmetic number, because the mean of its divisors is an integer number (56071088542).

Almost surely, 2^320406220220 is an apocalyptic number.

It is an amenable number.

320406220220 is an abundant number, since it is smaller than the sum of its proper divisors (352446842284).

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

320406220220 is a wasteful number, since it uses less digits than its factorization.

320406220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16020311020 (or 16020311018 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 320406220220 its reverse (22022604023), we get a palindrome (342428824243).

The spelling of 320406220220 in words is "three hundred twenty billion, four hundred six million, two hundred twenty thousand, two hundred twenty".