20321000320 has 192 divisors, whose sum is σ = 51976229760. Its totient is φ = 7595458560.

The previous prime is 20321000299. The next prime is 20321000363. The reversal of 20321000320 is 2300012302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321000320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33477457 + ... + 33478063.

It is an arithmetic number, because the mean of its divisors is an integer number (270709530).

Almost surely, 2^20321000320 is an apocalyptic number.

20321000320 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 20321000320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25988114880).

20321000320 is an abundant number, since it is smaller than the sum of its proper divisors (31655229440).

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

20321000320 is a wasteful number, since it uses less digits than its factorization.

20321000320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 20321000320 its reverse (2300012302), we get a palindrome (22621012622).

The spelling of 20321000320 in words is "twenty billion, three hundred twenty-one million, three hundred twenty", and thus it is an aban number.