20031131232 has 144 divisors (see below), whose sum is σ = 65746410912. Its totient is φ = 5666457600.

The previous prime is 20031131221. The next prime is 20031131233. The reversal of 20031131232 is 23213113002.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031131233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154428 + ... + 252804.

It is an arithmetic number, because the mean of its divisors is an integer number (456572298).

Almost surely, 2^20031131232 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 20031131232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32873205456).

20031131232 is an abundant number, since it is smaller than the sum of its proper divisors (45715279680).

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

20031131232 is a wasteful number, since it uses less digits than its factorization.

20031131232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98501 (or 98490 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20031131232 its reverse (23213113002), we get a palindrome (43244244234).

The spelling of 20031131232 in words is "twenty billion, thirty-one million, one hundred thirty-one thousand, two hundred thirty-two".