12020021020 has 96 divisors (see below), whose sum is σ = 30572277120. Its totient is φ = 3875266560.

The previous prime is 12020021011. The next prime is 12020021047. The reversal of 12020021020 is 2012002021.

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 = 12020020988 and 12020021006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4923000 + ... + 4925440.

It is an arithmetic number, because the mean of its divisors is an integer number (318461220).

Almost surely, 2^12020021020 is an apocalyptic number.

12020021020 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 12020021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15286138560).

12020021020 is an abundant number, since it is smaller than the sum of its proper divisors (18552256100).

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

12020021020 is a wasteful number, since it uses less digits than its factorization.

12020021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543 (or 4541 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 12020021020 its reverse (2012002021), we get a palindrome (14032023041).

The spelling of 12020021020 in words is "twelve billion, twenty million, twenty-one thousand, twenty".