20312440000 has 140 divisors (see below), whose sum is σ = 51996205888. Its totient is φ = 7862400000.

The previous prime is 20312439989. The next prime is 20312440003. The reversal of 20312440000 is 4421302.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20312440003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1231810 + ... + 1248190.

Almost surely, 2^20312440000 is an apocalyptic number.

20312440000 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 20312440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25998102944).

20312440000 is an abundant number, since it is smaller than the sum of its proper divisors (31683765888).

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

20312440000 is an equidigital number, since it uses as much as digits as its factorization.

20312440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16444 (or 16419 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20312440000 its reverse (4421302), we get a palindrome (20316861302).

The spelling of 20312440000 in words is "twenty billion, three hundred twelve million, four hundred forty thousand".