20111020020 has 432 divisors, whose sum is σ = 78218300160. Its totient is φ = 4143508992.

The previous prime is 20111020019. The next prime is 20111020031. The reversal of 20111020020 is 2002011102.

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 = 20111019984 and 20111020011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4928341 + ... + 4932419.

It is an arithmetic number, because the mean of its divisors is an integer number (181060880).

Almost surely, 2^20111020020 is an apocalyptic number.

20111020020 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 20111020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39109150080).

20111020020 is an abundant number, since it is smaller than the sum of its proper divisors (58107280140).

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

20111020020 is a wasteful number, since it uses less digits than its factorization.

20111020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4164 (or 4152 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20111020020 its reverse (2002011102), we get a palindrome (22113031122).

The spelling of 20111020020 in words is "twenty billion, one hundred eleven million, twenty thousand, twenty".