20211000002020 has 96 divisors (see below), whose sum is σ = 45338467880160. Its totient is φ = 7541513256960.

The previous prime is 20211000001993. The next prime is 20211000002069. The reversal of 20211000002020 is 2020000011202.

It can be written as a sum of positive squares in 16 ways, for example, as 1906652825856 + 18304347176164 = 1380816^2 + 4278358^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20211000001988 and 20211000002006.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29519326 + ... + 30196234.

It is an arithmetic number, because the mean of its divisors is an integer number (472275707085).

Almost surely, 2^{20211000002020} is an apocalyptic number.

20211000002020 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 20211000002020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22669233940080).

20211000002020 is an abundant number, since it is smaller than the sum of its proper divisors (25127467878140).

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

20211000002020 is a wasteful number, since it uses less digits than its factorization.

20211000002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677713 (or 677711 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20211000002020 its reverse (2020000011202), we get a palindrome (22231000013222).

The spelling of 20211000002020 in words is "twenty trillion, two hundred eleven billion, two thousand, twenty".