1313321020 has 48 divisors (see below), whose sum is σ = 3082103136. Its totient is φ = 465920000.

The previous prime is 1313321017. The next prime is 1313321039. The reversal of 1313321020 is 201233131.

It is a junction number, because it is equal to n+sod(n) for n = 1313320985 and 1313321003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63781 + ... + 81820.

It is an arithmetic number, because the mean of its divisors is an integer number (64210482).

Almost surely, 2^1313321020 is an apocalyptic number.

1313321020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1313321020 is an abundant number, since it is smaller than the sum of its proper divisors (1768782116).

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

1313321020 is a wasteful number, since it uses less digits than its factorization.

1313321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145662 (or 145660 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1313321020 is about 36239.7712465187. The cubic root of 1313321020 is about 1095.1080340717.

Adding to 1313321020 its reverse (201233131), we get a palindrome (1514554151).

The spelling of 1313321020 in words is "one billion, three hundred thirteen million, three hundred twenty-one thousand, twenty".