20112020 has 48 divisors (see below), whose sum is σ = 45133200. Its totient is φ = 7501824.

The previous prime is 20112007. The next prime is 20112023. The reversal of 20112020 is 2021102.

It can be written as a sum of positive squares in 8 ways, for example, as 59536 + 20052484 = 244^2 + 4478^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20111989 and 20112007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50462 + ... + 50858.

It is an arithmetic number, because the mean of its divisors is an integer number (940275).

Almost surely, 2^20112020 is an apocalyptic number.

20112020 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 20112020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22566600).

20112020 is an abundant number, since it is smaller than the sum of its proper divisors (25021180).

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

20112020 is a wasteful number, since it uses less digits than its factorization.

20112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 570 counting only the distinct ones).

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

The square root of 20112020 is about 4484.6426836483. The cubic root of 20112020 is about 271.9476002001.

Adding to 20112020 its reverse (2021102), we get a palindrome (22133122).

It can be divided in two parts, 201 and 12020, that added together give a palindrome (12221).

The spelling of 20112020 in words is "twenty million, one hundred twelve thousand, twenty".