20201220100020 has 24 divisors (see below), whose sum is σ = 56563416280224. Its totient is φ = 5386992026656.

The previous prime is 20201220099971. The next prime is 20201220100043. The reversal of 20201220100020 is 2000102210202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20201220099969 and 20201220100005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168343500774 + ... + 168343500893.

It is an arithmetic number, because the mean of its divisors is an integer number (2356809011676).

Almost surely, 2^{20201220100020} is an apocalyptic number.

20201220100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201220100020 is an abundant number, since it is smaller than the sum of its proper divisors (36362196180204).

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

20201220100020 is a wasteful number, since it uses less digits than its factorization.

20201220100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336687001679 (or 336687001677 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20201220100020 its reverse (2000102210202), we get a palindrome (22201322310222).

The spelling of 20201220100020 in words is "twenty trillion, two hundred one billion, two hundred twenty million, one hundred thousand, twenty".