20131311320 has 16 divisors (see below), whose sum is σ = 45295450560. Its totient is φ = 8052524512.

The previous prime is 20131311307. The next prime is 20131311323. The reversal of 20131311320 is 2311313102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131311323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251641352 + ... + 251641431.

It is an arithmetic number, because the mean of its divisors is an integer number (2830965660).

Almost surely, 2^20131311320 is an apocalyptic number.

20131311320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131311320 is an abundant number, since it is smaller than the sum of its proper divisors (25164139240).

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

20131311320 is a wasteful number, since it uses less digits than its factorization.

20131311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503282794 (or 503282790 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20131311320 its reverse (2311313102), we get a palindrome (22442624422).

The spelling of 20131311320 in words is "twenty billion, one hundred thirty-one million, three hundred eleven thousand, three hundred twenty".