20011211010020 has 24 divisors (see below), whose sum is σ = 42241281694584. Its totient is φ = 7963010390016.

The previous prime is 20011211009983. The next prime is 20011211010059. The reversal of 20011211010020 is 2001011211002.

It can be written as a sum of positive squares in 4 ways, for example, as 4981431175744 + 15029779834276 = 2231912^2 + 3876826^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20011211009983 and 20011211010010.

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, 2592121919 + ... + 2592129638.

It is an arithmetic number, because the mean of its divisors is an integer number (1760053403941).

Almost surely, 2^{20011211010020} is an apocalyptic number.

20011211010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011211010020 is an abundant number, since it is smaller than the sum of its proper divisors (22230070684564).

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

20011211010020 is a wasteful number, since it uses less digits than its factorization.

20011211010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5184251759 (or 5184251757 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011211010020 its reverse (2001011211002), we get a palindrome (22012222221022).

The spelling of 20011211010020 in words is "twenty trillion, eleven billion, two hundred eleven million, ten thousand, twenty".