11111120020 has 192 divisors, whose sum is σ = 32059754496. Its totient is φ = 3122219520.

The previous prime is 11111120011. The next prime is 11111120047. The reversal of 11111120020 is 2002111111.

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 = 11111119979 and 11111120006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 854407 + ... + 867313.

It is an arithmetic number, because the mean of its divisors is an integer number (166977888).

Almost surely, 2^11111120020 is an apocalyptic number.

11111120020 is a gapful number since it is divisible by the number (10) 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 11111120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16029877248).

11111120020 is an abundant number, since it is smaller than the sum of its proper divisors (20948634476).

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

11111120020 is a wasteful number, since it uses less digits than its factorization.

11111120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990 (or 12988 counting only the distinct ones).

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

Adding to 11111120020 its reverse (2002111111), we get a palindrome (13113231131).

It can be divided in two parts, 111111 and 20020, that added together give a palindrome (131131).

The spelling of 11111120020 in words is "eleven billion, one hundred eleven million, one hundred twenty thousand, twenty".