It is an unprimeable number.
Almost surely, 220011220100 is an apocalyptic number.
20011220100 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 20011220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32766434064).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20011220100 is a wasteful number, since it uses less digits than its factorization.
20011220100 is an odious number, because the sum of its binary digits is odd.
Adding to 20011220100 its reverse (102211002), we get a palindrome (20113431102).
The spelling of 20011220100 in words is "twenty billion, eleven million, two hundred twenty thousand, one hundred".