Adding to 20120100 its reverse (102102), we get a palindrome (20222202).
It is a happy number.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a congruent number.
It is an unprimeable number.
Almost surely, 220120100 is an apocalyptic number.
20120100 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 20120100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39664128).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20120100 is a wasteful number, since it uses less digits than its factorization.
20120100 is an evil number, because the sum of its binary digits is even.
The square root of 20120100 is about 4485.5434453364. The cubic root of 20120100 is about 271.9840136222.
The spelling of 20120100 in words is "twenty million, one hundred twenty thousand, one hundred".