12001022020 has 48 divisors (see below), whose sum is σ = 27202855680. Its totient is φ = 4421010816.

The previous prime is 12001021999. The next prime is 12001022029. The reversal of 12001022020 is 2022010021.

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 = 12001021988 and 12001022006.

It is not an unprimeable number, because it can be changed into a prime (12001022029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61569 + ... + 166711.

It is an arithmetic number, because the mean of its divisors is an integer number (566726160).

Almost surely, 2^12001022020 is an apocalyptic number.

12001022020 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 12001022020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13601427840).

12001022020 is an abundant number, since it is smaller than the sum of its proper divisors (15201833660).

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

12001022020 is a wasteful number, since it uses less digits than its factorization.

12001022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105604 (or 105602 counting only the distinct ones).

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

Adding to 12001022020 its reverse (2022010021), we get a palindrome (14023032041).

The spelling of 12001022020 in words is "twelve billion, one million, twenty-two thousand, twenty".