20020312320 has 144 divisors (see below), whose sum is σ = 64004834880. Its totient is φ = 5333327872.

The previous prime is 20020312309. The next prime is 20020312321. The reversal of 20020312320 is 2321302002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20020312320.

It is not an unprimeable number, because it can be changed into a prime (20020312321) 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, 5016886 + ... + 5020874.

It is an arithmetic number, because the mean of its divisors is an integer number (444478020).

Almost surely, 2^20020312320 is an apocalyptic number.

20020312320 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 20020312320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32002417440).

20020312320 is an abundant number, since it is smaller than the sum of its proper divisors (43984522560).

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

20020312320 is a wasteful number, since it uses less digits than its factorization.

20020312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320 (or 5306 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 20020312320 its reverse (2321302002), we get a palindrome (22341614322).

The spelling of 20020312320 in words is "twenty billion, twenty million, three hundred twelve thousand, three hundred twenty".