20111100111020 has 12 divisors (see below), whose sum is σ = 42233310233184. Its totient is φ = 8044440044400.

The previous prime is 20111100110993. The next prime is 20111100111029. The reversal of 20111100111020 is 2011100111102.

It is a junction number, because it is equal to n+sod(n) for n = 20111100110992 and 20111100111010.

It is not an unprimeable number, because it can be changed into a prime (20111100111029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502777502756 + ... + 502777502795.

It is an arithmetic number, because the mean of its divisors is an integer number (3519442519432).

Almost surely, 2^{20111100111020} is an apocalyptic number.

20111100111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111100111020 is an abundant number, since it is smaller than the sum of its proper divisors (22122210122164).

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

20111100111020 is a wasteful number, since it uses less digits than its factorization.

20111100111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005555005560 (or 1005555005558 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20111100111020 its reverse (2011100111102), we get a palindrome (22122200222122).

The spelling of 20111100111020 in words is "twenty trillion, one hundred eleven billion, one hundred million, one hundred eleven thousand, twenty".