20312323240 has 96 divisors (see below), whose sum is σ = 50545383840. Its totient is φ = 7340699520.

The previous prime is 20312323237. The next prime is 20312323243. The reversal of 20312323240 is 4232321302.

It is an interprime number because it is at equal distance from previous prime (20312323237) and next prime (20312323243).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20312323243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 776047 + ... + 801793.

It is an arithmetic number, because the mean of its divisors is an integer number (526514415).

Almost surely, 2^20312323240 is an apocalyptic number.

20312323240 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 20312323240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25272691920).

20312323240 is an abundant number, since it is smaller than the sum of its proper divisors (30233060600).

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

20312323240 is a wasteful number, since it uses less digits than its factorization.

20312323240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25943 (or 25928 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20312323240 its reverse (4232321302), we get a palindrome (24544644542).

The spelling of 20312323240 in words is "twenty billion, three hundred twelve million, three hundred twenty-three thousand, two hundred forty".