20320211031320 has 128 divisors (see below), whose sum is σ = 48316001817600. Its totient is φ = 7682835342336.

The previous prime is 20320211031313. The next prime is 20320211031349. The reversal of 20320211031320 is 2313011202302.

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 = 20320211031292 and 20320211031301.

It is a congruent number.

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, 5782607 + ... + 8606913.

It is an arithmetic number, because the mean of its divisors is an integer number (377468764200).

Almost surely, 2^{20320211031320} is an apocalyptic number.

20320211031320 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 20320211031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24158000908800).

20320211031320 is an abundant number, since it is smaller than the sum of its proper divisors (27995790786280).

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

20320211031320 is a wasteful number, since it uses less digits than its factorization.

20320211031320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824497 (or 2824493 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20320211031320 its reverse (2313011202302), we get a palindrome (22633222233622).

The spelling of 20320211031320 in words is "twenty trillion, three hundred twenty billion, two hundred eleven million, thirty-one thousand, three hundred twenty".