20111111020 has 96 divisors (see below), whose sum is σ = 56704951296. Its totient is φ = 5786208000.

The previous prime is 20111111003. The next prime is 20111111021. The reversal of 20111111020 is 2011111102.

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 = 20111110988 and 20111111006.

It is not an unprimeable number, because it can be changed into a prime (20111111021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 482256 + ... + 522295.

It is an arithmetic number, because the mean of its divisors is an integer number (590676576).

Almost surely, 2^20111111020 is an apocalyptic number.

20111111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111111020 is an abundant number, since it is smaller than the sum of its proper divisors (36593840276).

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

20111111020 is a wasteful number, since it uses less digits than its factorization.

20111111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004591 (or 1004589 counting only the distinct ones).

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

20111111020 divided by its sum of digits (10) gives a palindrome (2011111102).

Adding to 20111111020 its reverse (2011111102), we get a palindrome (22122222122).

It can be divided in two parts, 20111 and 111020, that added together give a palindrome (131131).

The spelling of 20111111020 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, twenty".