20010021120020 has 12 divisors (see below), whose sum is σ = 42021044352084. Its totient is φ = 8004008448000.

The previous prime is 20010021119989. The next prime is 20010021120041. The reversal of 20010021120020 is 2002112001002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2771199454864 + 17238821665156 = 1664692^2 + 4151966^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20010021119983 and 20010021120010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500250527981 + ... + 500250528020.

It is an arithmetic number, because the mean of its divisors is an integer number (3501753696007).

Almost surely, 2^{20010021120020} is an apocalyptic number.

20010021120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010021120020 is an abundant number, since it is smaller than the sum of its proper divisors (22011023232064).

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

20010021120020 is a wasteful number, since it uses less digits than its factorization.

20010021120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000501056010 (or 1000501056008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20010021120020 its reverse (2002112001002), we get a palindrome (22012133121022).

The spelling of 20010021120020 in words is "twenty trillion, ten billion, twenty-one million, one hundred twenty thousand, twenty".