It is a happy number.
It is a congruent number.
Almost surely, 220434404102 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20434404102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23793149952).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20434404102 is a wasteful number, since it uses less digits than its factorization.
20434404102 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 27953.
Adding to 20434404102 its reverse (20140443402), we get a palindrome (40574847504).
The spelling of 20434404102 in words is "twenty billion, four hundred thirty-four million, four hundred four thousand, one hundred two".