20660244 has 48 divisors (see below), whose sum is σ = 52871616. Its totient is φ = 6227200.

The previous prime is 20660243. The next prime is 20660251. The reversal of 20660244 is 44206602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36814 + ... + 37370.

It is an arithmetic number, because the mean of its divisors is an integer number (1101492).

Almost surely, 2^20660244 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 20660244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26435808).

20660244 is an abundant number, since it is smaller than the sum of its proper divisors (32211372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20660244 is a wasteful number, since it uses less digits than its factorization.

20660244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20660244 is about 4545.3541116177. The cubic root of 20660244 is about 274.3964460209.

Adding to 20660244 its reverse (44206602), we get a palindrome (64866846).

The spelling of 20660244 in words is "twenty million, six hundred sixty thousand, two hundred forty-four".