11111000020 has 24 divisors (see below), whose sum is σ = 23547169800. Its totient is φ = 4403624832.

The previous prime is 11111000009. The next prime is 11111000023. The reversal of 11111000020 is 2000011111.

It can be written as a sum of positive squares in 4 ways, for example, as 4589791504 + 6521208516 = 67748^2 + 80754^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11110999967 and 11111000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111000023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2546215 + ... + 2550574.

It is an arithmetic number, because the mean of its divisors is an integer number (981132075).

Almost surely, 2^11111000020 is an apocalyptic number.

11111000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111000020 is an abundant number, since it is smaller than the sum of its proper divisors (12436169780).

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

11111000020 is a wasteful number, since it uses less digits than its factorization.

11111000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5096907 (or 5096905 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 11111000020 its reverse (2000011111), we get a palindrome (13111011131).

The spelling of 11111000020 in words is "eleven billion, one hundred eleven million, twenty", and thus it is an aban number.