20131320032 has 96 divisors (see below), whose sum is σ = 43893964800. Its totient is φ = 9040058368.

The previous prime is 20131320029. The next prime is 20131320089. The reversal of 20131320032 is 23002313102.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 5991569 + ... + 5994927.

It is an arithmetic number, because the mean of its divisors is an integer number (457228800).

Almost surely, 2^20131320032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20131320032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21946982400).

20131320032 is an abundant number, since it is smaller than the sum of its proper divisors (23762644768).

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

20131320032 is a wasteful number, since it uses less digits than its factorization.

20131320032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888 (or 3880 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20131320032 its reverse (23002313102), we get a palindrome (43133633134).

The spelling of 20131320032 in words is "twenty billion, one hundred thirty-one million, three hundred twenty thousand, thirty-two".