20102221020 has 96 divisors (see below), whose sum is σ = 64347107328. Its totient is φ = 4593364992.

The previous prime is 20102221001. The next prime is 20102221159. The reversal of 20102221020 is 2012220102.

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 = 20102220987 and 20102221005.

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, 1970172 + ... + 1980348.

It is an arithmetic number, because the mean of its divisors is an integer number (670282368).

Almost surely, 2^20102221020 is an apocalyptic number.

20102221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102221020 is an abundant number, since it is smaller than the sum of its proper divisors (44244886308).

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

20102221020 is a wasteful number, since it uses less digits than its factorization.

20102221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14899 (or 14897 counting only the distinct ones).

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

Adding to 20102221020 its reverse (2012220102), we get a palindrome (22114441122).

The spelling of 20102221020 in words is "twenty billion, one hundred two million, two hundred twenty-one thousand, twenty".