20728206 has 24 divisors (see below), whose sum is σ = 46008144. Its totient is φ = 6740640.

The previous prime is 20728199. The next prime is 20728217. The reversal of 20728206 is 60282702.

It is a self number, because there is not a number n which added to its sum of digits gives 20728206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13306 + ... + 14781.

It is an arithmetic number, because the mean of its divisors is an integer number (1917006).

Almost surely, 2^20728206 is an apocalyptic number.

20728206 is an abundant number, since it is smaller than the sum of its proper divisors (25279938).

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

20728206 is a wasteful number, since it uses less digits than its factorization.

20728206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28136 (or 28133 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20728206 is about 4552.8239588194. The cubic root of 20728206 is about 274.6969929780.

The spelling of 20728206 in words is "twenty million, seven hundred twenty-eight thousand, two hundred six".