20001022000020 has 288 divisors, whose sum is σ = 61958338041600. Its totient is φ = 5221463869440.

The previous prime is 20001021999983. The next prime is 20001022000033. The reversal of 20001022000020 is 2000022010002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20001021999966 and 20001022000011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3616164655 + ... + 3616170185.

It is an arithmetic number, because the mean of its divisors is an integer number (215133118200).

Almost surely, 2^{20001022000020} is an apocalyptic number.

20001022000020 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 20001022000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30979169020800).

20001022000020 is an abundant number, since it is smaller than the sum of its proper divisors (41957316041580).

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

20001022000020 is a wasteful number, since it uses less digits than its factorization.

20001022000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7615 (or 7610 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20001022000020 its reverse (2000022010002), we get a palindrome (22001044010022).

The spelling of 20001022000020 in words is "twenty trillion, one billion, twenty-two million, twenty", and thus it is an aban number and an uban number.