20101111101020 has 48 divisors (see below), whose sum is σ = 44696148180768. Its totient is φ = 7567352432640.

The previous prime is 20101111100947. The next prime is 20101111101041. The reversal of 20101111101020 is 2010111110102.

It is a junction number, because it is equal to n+sod(n) for n = 20101111100992 and 20101111101010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21656675 + ... + 22565765.

It is an arithmetic number, because the mean of its divisors is an integer number (931169753766).

Almost surely, 2^{20101111101020} is an apocalyptic number.

20101111101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101111101020 is an abundant number, since it is smaller than the sum of its proper divisors (24595037079748).

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

20101111101020 is a wasteful number, since it uses less digits than its factorization.

20101111101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974150 (or 974148 counting only the distinct ones).

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

Adding to 20101111101020 its reverse (2010111110102), we get a palindrome (22111222211122).

The spelling of 20101111101020 in words is "twenty trillion, one hundred one billion, one hundred eleven million, one hundred one thousand, twenty".