20122221020 has 96 divisors (see below), whose sum is σ = 49162256640. Its totient is φ = 6837027840.

The previous prime is 20122221017. The next prime is 20122221029. The reversal of 20122221020 is 2012222102.

It is a junction number, because it is equal to n+sod(n) for n = 20122220986 and 20122221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122221029) by changing a digit.

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, 500507 + ... + 539213.

It is an arithmetic number, because the mean of its divisors is an integer number (512106840).

Almost surely, 2^20122221020 is an apocalyptic number.

20122221020 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 20122221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24581128320).

20122221020 is an abundant number, since it is smaller than the sum of its proper divisors (29040035620).

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

20122221020 is a wasteful number, since it uses less digits than its factorization.

20122221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38883 (or 38881 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20122221020 its reverse (2012222102), we get a palindrome (22134443122).

It can be divided in two parts, 20122 and 221020, that added together give a palindrome (241142).

The spelling of 20122221020 in words is "twenty billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty".