20537728 has 32 divisors (see below), whose sum is σ = 41132520. Its totient is φ = 10214400.

The previous prime is 20537719. The next prime is 20537743. The reversal of 20537728 is 82773502.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 20537693 and 20537702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35683 + ... + 36253.

Almost surely, 2^20537728 is an apocalyptic number.

It is an amenable number.

20537728 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20537728 is an equidigital number, since it uses as much as digits as its factorization.

20537728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 20537728 is about 4531.8570145140. The cubic root of 20537728 is about 273.8529766945.

The spelling of 20537728 in words is "twenty million, five hundred thirty-seven thousand, seven hundred twenty-eight".