20022121020 has 96 divisors (see below), whose sum is σ = 61207243776. Its totient is φ = 4849977600.

The previous prime is 20022121019. The next prime is 20022121027. The reversal of 20022121020 is 2012122002.

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 = 20022120987 and 20022121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022121027) 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, 864390 + ... + 887250.

It is an arithmetic number, because the mean of its divisors is an integer number (637575456).

Almost surely, 2^20022121020 is an apocalyptic number.

20022121020 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 20022121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30603621888).

20022121020 is an abundant number, since it is smaller than the sum of its proper divisors (41185122756).

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

20022121020 is a wasteful number, since it uses less digits than its factorization.

20022121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24211 (or 24209 counting only the distinct ones).

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

Adding to 20022121020 its reverse (2012122002), we get a palindrome (22034243022).

The spelling of 20022121020 in words is "twenty billion, twenty-two million, one hundred twenty-one thousand, twenty".