20312231232 has 112 divisors (see below), whose sum is σ = 54219156992. Its totient is φ = 6710999040.

The previous prime is 20312231221. The next prime is 20312231237. The reversal of 20312231232 is 23213221302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20312231199 and 20312231208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312231237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12961713 + ... + 12963279.

It is an arithmetic number, because the mean of its divisors is an integer number (484099616).

Almost surely, 2^20312231232 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 20312231232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27109578496).

20312231232 is an abundant number, since it is smaller than the sum of its proper divisors (33906925760).

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

20312231232 is a wasteful number, since it uses less digits than its factorization.

20312231232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2126 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20312231232 its reverse (23213221302), we get a palindrome (43525452534).

The spelling of 20312231232 in words is "twenty billion, three hundred twelve million, two hundred thirty-one thousand, two hundred thirty-two".