20021122020 has 96 divisors (see below), whose sum is σ = 59510505600. Its totient is φ = 5011892224.

The previous prime is 20021122019. The next prime is 20021122021. The reversal of 20021122020 is 2022112002.

It is an interprime number because it is at equal distance from previous prime (20021122019) and next prime (20021122021).

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 = 20021121987 and 20021122005.

It is not an unprimeable number, because it can be changed into a prime (20021122021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371551 + ... + 422009.

It is an arithmetic number, because the mean of its divisors is an integer number (619901100).

Almost surely, 2^20021122020 is an apocalyptic number.

20021122020 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 20021122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29755252800).

20021122020 is an abundant number, since it is smaller than the sum of its proper divisors (39489383580).

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

20021122020 is a wasteful number, since it uses less digits than its factorization.

20021122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50877 (or 50875 counting only the distinct ones).

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

Adding to 20021122020 its reverse (2022112002), we get a palindrome (22043234022).

The spelling of 20021122020 in words is "twenty billion, twenty-one million, one hundred twenty-two thousand, twenty".