1320221020 has 48 divisors (see below), whose sum is σ = 2942267328. Its totient is φ = 495887360.

The previous prime is 1320221011. The next prime is 1320221039. The reversal of 1320221020 is 201220231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152529 + ... + 160951.

It is an arithmetic number, because the mean of its divisors is an integer number (61297236).

Almost surely, 2^1320221020 is an apocalyptic number.

1320221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471133664).

1320221020 is an abundant number, since it is smaller than the sum of its proper divisors (1622046308).

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

1320221020 is a wasteful number, since it uses less digits than its factorization.

1320221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8910 (or 8908 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1320221020 is about 36334.8458094981. The cubic root of 1320221020 is about 1097.0225319154.

Adding to 1320221020 its reverse (201220231), we get a palindrome (1521441251).

The spelling of 1320221020 in words is "one billion, three hundred twenty million, two hundred twenty-one thousand, twenty".