It is an unprimeable number.
Almost surely, 220716722 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20716722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25110582).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20716722 is a wasteful number, since it uses less digits than its factorization.
20716722 is an evil number, because the sum of its binary digits is even.
The square root of 20716722 is about 4551.5625888260. The cubic root of 20716722 is about 274.6462536934.
The spelling of 20716722 in words is "twenty million, seven hundred sixteen thousand, seven hundred twenty-two".