20131312101320 has 128 divisors (see below), whose sum is σ = 51911973999360. Its totient is φ = 6882742886400.

The previous prime is 20131312101319. The next prime is 20131312101413. The reversal of 20131312101320 is 2310121313102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20131312101292 and 20131312101301.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371282852 + ... + 371337068.

It is an arithmetic number, because the mean of its divisors is an integer number (405562296870).

Almost surely, 2^{20131312101320} is an apocalyptic number.

20131312101320 is a gapful number since it is divisible by the number (20) 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 20131312101320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25955986999680).

20131312101320 is an abundant number, since it is smaller than the sum of its proper divisors (31780661898040).

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

20131312101320 is a wasteful number, since it uses less digits than its factorization.

20131312101320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57943 (or 57939 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20131312101320 its reverse (2310121313102), we get a palindrome (22441433414422).

The spelling of 20131312101320 in words is "twenty trillion, one hundred thirty-one billion, three hundred twelve million, one hundred one thousand, three hundred twenty".