2001111100020 has 36 divisors (see below), whose sum is σ = 6070037003940. Its totient is φ = 533629626624.

The previous prime is 2001111100019. The next prime is 2001111100031. The reversal of 2001111100020 is 200011111002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1584365968656 + 416745131364 = 1258716^2 + 645558^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2001111099975 and 2001111100011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5558641765 + ... + 5558642124.

Almost surely, 2^{2001111100020} is an apocalyptic number.

2001111100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001111100020 is an abundant number, since it is smaller than the sum of its proper divisors (4068925903920).

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

2001111100020 is a wasteful number, since it uses less digits than its factorization.

2001111100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11117283904 (or 11117283899 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 2001111100020 its reverse (200011111002), we get a palindrome (2201122211022).

The spelling of 2001111100020 in words is "two trillion, one billion, one hundred eleven million, one hundred thousand, twenty".