20021320320000 has 440 divisors, whose sum is σ = 66877111224000. Its totient is φ = 5323542528000.

The previous prime is 20021320319983. The next prime is 20021320320013. The reversal of 20021320320000 is 2302312002.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 670065061 + ... + 670094939.

It is an arithmetic number, because the mean of its divisors is an integer number (151993434600).

Almost surely, 2^{20021320320000} is an apocalyptic number.

20021320320000 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 20021320320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33438555612000).

20021320320000 is an abundant number, since it is smaller than the sum of its proper divisors (46855790904000).

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

20021320320000 is an equidigital number, since it uses as much as digits as its factorization.

20021320320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30271 (or 30238 counting only the distinct ones).

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

Adding to 20021320320000 its reverse (2302312002), we get a palindrome (20023622632002).

The spelling of 20021320320000 in words is "twenty trillion, twenty-one billion, three hundred twenty million, three hundred twenty thousand".