20201221022020 has 12 divisors (see below), whose sum is σ = 42422564146284. Its totient is φ = 8080488408800.

The previous prime is 20201221021981. The next prime is 20201221022051. The reversal of 20201221022020 is 2022012210202.

It can be written as a sum of positive squares in 2 ways, for example, as 2499864561216 + 17701356460804 = 1581096^2 + 4207298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20201221021985 and 20201221022003.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505030525531 + ... + 505030525570.

It is an arithmetic number, because the mean of its divisors is an integer number (3535213678857).

Almost surely, 2^{20201221022020} is an apocalyptic number.

20201221022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201221022020 is an abundant number, since it is smaller than the sum of its proper divisors (22221343124264).

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

20201221022020 is a wasteful number, since it uses less digits than its factorization.

20201221022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010061051110 (or 1010061051108 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20201221022020 its reverse (2022012210202), we get a palindrome (22223233232222).

The spelling of 20201221022020 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, twenty-two thousand, twenty".