1320818220 has 36 divisors (see below), whose sum is σ = 4006482480. Its totient is φ = 352218144.

The previous prime is 1320818207. The next prime is 1320818221. The reversal of 1320818220 is 228180231.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1320818221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3668760 + ... + 3669119.

It is an arithmetic number, because the mean of its divisors is an integer number (111291180).

Almost surely, 2^1320818220 is an apocalyptic number.

1320818220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320818220 is an abundant number, since it is smaller than the sum of its proper divisors (2685664260).

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

1320818220 is a wasteful number, since it uses less digits than its factorization.

1320818220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7337894 (or 7337889 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1320818220 is about 36343.0628868839. The cubic root of 1320818220 is about 1097.1879191464.

Adding to 1320818220 its reverse (228180231), we get a palindrome (1548998451).

The spelling of 1320818220 in words is "one billion, three hundred twenty million, eight hundred eighteen thousand, two hundred twenty".