20020021803520 has 640 divisors, whose sum is σ = 52554498796800. Its totient is φ = 7288927027200.

The previous prime is 20020021803517. The next prime is 20020021803569. The reversal of 20020021803520 is 2530812002002.

It is a tau number, because it is divible by the number of its divisors (640).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51465351486 + ... + 51465351874.

It is an arithmetic number, because the mean of its divisors is an integer number (82116404370).

Almost surely, 2^{20020021803520} is an apocalyptic number.

20020021803520 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 20020021803520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26277249398400).

20020021803520 is an abundant number, since it is smaller than the sum of its proper divisors (32534476993280).

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

20020021803520 is a wasteful number, since it uses less digits than its factorization.

20020021803520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 20020021803520 its reverse (2530812002002), we get a palindrome (22550833805522).

The spelling of 20020021803520 in words is "twenty trillion, twenty billion, twenty-one million, eight hundred three thousand, five hundred twenty".