It is a congruent number.
Almost surely, 220671164 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20671164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28129920).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20671164 is a wasteful number, since it uses less digits than its factorization.
20671164 is an odious number, because the sum of its binary digits is odd.
The square root of 20671164 is about 4546.5551794738. Note that the first 3 decimals coincide. The cubic root of 20671164 is about 274.4447817106. Note that the first 3 decimals are identical.
Adding to 20671164 its reverse (46117602), we get a palindrome (66788766).
The spelling of 20671164 in words is "twenty million, six hundred seventy-one thousand, one hundred sixty-four".