20111101020 has 144 divisors (see below), whose sum is σ = 61641216000. Its totient is φ = 5307175296.

The previous prime is 20111101009. The next prime is 20111101051. The reversal of 20111101020 is 2010111102.

It is a happy number.

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 = 20111100993 and 20111101011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8981061 + ... + 8983299.

It is an arithmetic number, because the mean of its divisors is an integer number (428064000).

Almost surely, 2^20111101020 is an apocalyptic number.

20111101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111101020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30820608000).

20111101020 is an abundant number, since it is smaller than the sum of its proper divisors (41530114980).

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

20111101020 is a wasteful number, since it uses less digits than its factorization.

20111101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752 (or 2747 counting only the distinct ones).

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

Adding to 20111101020 its reverse (2010111102), we get a palindrome (22121212122).

The spelling of 20111101020 in words is "twenty billion, one hundred eleven million, one hundred one thousand, twenty".