20966728 has 32 divisors (see below), whose sum is σ = 41616000. Its totient is φ = 9875520.

The previous prime is 20966723. The next prime is 20966749. The reversal of 20966728 is 82766902.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20966723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40938 + ... + 41446.

It is an arithmetic number, because the mean of its divisors is an integer number (1300500).

Almost surely, 2^20966728 is an apocalyptic number.

It is an amenable number.

20966728 is a deficient number, since it is larger than the sum of its proper divisors (20649272).

20966728 is a wasteful number, since it uses less digits than its factorization.

20966728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20966728 is about 4578.9439830598. The cubic root of 20966728 is about 275.7466343884.

The spelling of 20966728 in words is "twenty million, nine hundred sixty-six thousand, seven hundred twenty-eight".