20131331320 has 64 divisors (see below), whose sum is σ = 48864928320. Its totient is φ = 7435843584.

The previous prime is 20131331291. The next prime is 20131331327. The reversal of 20131331320 is 2313313102.

It is a super-2 number, since 2×20131331320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131331327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243252 + ... + 315331.

It is an arithmetic number, because the mean of its divisors is an integer number (763514505).

Almost surely, 2^20131331320 is an apocalyptic number.

20131331320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20131331320 is an abundant number, since it is smaller than the sum of its proper divisors (28733597000).

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

20131331320 is a wasteful number, since it uses less digits than its factorization.

20131331320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558664 (or 558660 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20131331320 its reverse (2313313102), we get a palindrome (22444644422).

The spelling of 20131331320 in words is "twenty billion, one hundred thirty-one million, three hundred thirty-one thousand, three hundred twenty".