20111100101020 has 24 divisors (see below), whose sum is σ = 43689631255200. Its totient is φ = 7767045556032.

The previous prime is 20111100100961. The next prime is 20111100101047. The reversal of 20111100101020 is 2010100111102.

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 = 20111100100988 and 20111100101006.

It is a congruent number.

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, 17337154680 + ... + 17337155839.

It is an arithmetic number, because the mean of its divisors is an integer number (1820401302300).

Almost surely, 2^{20111100101020} is an apocalyptic number.

20111100101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111100101020 is an abundant number, since it is smaller than the sum of its proper divisors (23578531154180).

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

20111100101020 is a wasteful number, since it uses less digits than its factorization.

20111100101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34674310557 (or 34674310555 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111100101020 its reverse (2010100111102), we get a palindrome (22121200212122).

The spelling of 20111100101020 in words is "twenty trillion, one hundred eleven billion, one hundred million, one hundred one thousand, twenty".