It is an unprimeable number.
Almost surely, 220709612 is an apocalyptic number.
20709612 is a gapful number since it is divisible by the number (22) 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 20709612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33825792).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20709612 is a wasteful number, since it uses less digits than its factorization.
20709612 is an evil number, because the sum of its binary digits is even.
The square root of 20709612 is about 4550.7814713519. The cubic root of 20709612 is about 274.6148304741.
The spelling of 20709612 in words is "twenty million, seven hundred nine thousand, six hundred twelve".