20130031232 has 128 divisors (see below), whose sum is σ = 44394480000. Its totient is φ = 9053614080.

The previous prime is 20130031183. The next prime is 20130031237. The reversal of 20130031232 is 23213003102.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 20130031232.

It is not an unprimeable number, because it can be changed into a prime (20130031237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4299869 + ... + 4304547.

It is an arithmetic number, because the mean of its divisors is an integer number (346831875).

Almost surely, 2^20130031232 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 20130031232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22197240000).

20130031232 is an abundant number, since it is smaller than the sum of its proper divisors (24264448768).

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

20130031232 is a wasteful number, since it uses less digits than its factorization.

20130031232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4802 (or 4790 counting only the distinct ones).

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

Adding to 20130031232 its reverse (23213003102), we get a palindrome (43343034334).

The spelling of 20130031232 in words is "twenty billion, one hundred thirty million, thirty-one thousand, two hundred thirty-two".