22001122020 has 96 divisors (see below), whose sum is σ = 64014289920. Its totient is φ = 5639155200.

The previous prime is 22001122019. The next prime is 22001122051. The reversal of 22001122020 is 2022110022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22001121987 and 22001122005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 359670 + ... + 416370.

It is an arithmetic number, because the mean of its divisors is an integer number (666815520).

Almost surely, 2^22001122020 is an apocalyptic number.

22001122020 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 22001122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32007144960).

22001122020 is an abundant number, since it is smaller than the sum of its proper divisors (42013167900).

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

22001122020 is a wasteful number, since it uses less digits than its factorization.

22001122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56965 (or 56963 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22001122020 its reverse (2022110022), we get a palindrome (24023232042).

The spelling of 22001122020 in words is "twenty-two billion, one million, one hundred twenty-two thousand, twenty".