20221001220 has 96 divisors (see below), whose sum is σ = 68513534208. Its totient is φ = 4350062592.

The previous prime is 20221001201. The next prime is 20221001221. The reversal of 20221001220 is 2210012202.

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 = 20221001196 and 20221001205.

It is not an unprimeable number, because it can be changed into a prime (20221001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1408897 + ... + 1423176.

It is an arithmetic number, because the mean of its divisors is an integer number (713682648).

Almost surely, 2^20221001220 is an apocalyptic number.

20221001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20221001220 is an abundant number, since it is smaller than the sum of its proper divisors (48292532988).

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

20221001220 is a wasteful number, since it uses less digits than its factorization.

20221001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832109 (or 2832107 counting only the distinct ones).

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

Adding to 20221001220 its reverse (2210012202), we get a palindrome (22431013422).

The spelling of 20221001220 in words is "twenty billion, two hundred twenty-one million, one thousand, two hundred twenty".