20682728 has 32 divisors (see below), whose sum is σ = 42759360. Its totient is φ = 9300480.

The previous prime is 20682719. The next prime is 20682743. The reversal of 20682728 is 82728602.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7325 + ... + 9747.

It is an arithmetic number, because the mean of its divisors is an integer number (1336230).

Almost surely, 2^20682728 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 20682728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21379680).

20682728 is an abundant number, since it is smaller than the sum of its proper divisors (22076632).

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

20682728 is a wasteful number, since it uses less digits than its factorization.

20682728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537 (or 2533 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 20682728 is about 4547.8267337268. The cubic root of 20682728 is about 274.4959494118.

The spelling of 20682728 in words is "twenty million, six hundred eighty-two thousand, seven hundred twenty-eight".