20312443240 has 64 divisors (see below), whose sum is σ = 48282595200. Its totient is φ = 7669479168.

The previous prime is 20312443213. The next prime is 20312443247. The reversal of 20312443240 is 4234421302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20312443247) 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, 162277 + ... + 258763.

It is an arithmetic number, because the mean of its divisors is an integer number (754415550).

Almost surely, 2^20312443240 is an apocalyptic number.

20312443240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20312443240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24141297600).

20312443240 is an abundant number, since it is smaller than the sum of its proper divisors (27970151960).

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

20312443240 is a wasteful number, since it uses less digits than its factorization.

20312443240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96794 (or 96790 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20312443240 its reverse (4234421302), we get a palindrome (24546864542).

The spelling of 20312443240 in words is "twenty billion, three hundred twelve million, four hundred forty-three thousand, two hundred forty".