20728044 has 36 divisors (see below), whose sum is σ = 53260480. Its totient is φ = 6795360.

The previous prime is 20728033. The next prime is 20728061. The reversal of 20728044 is 44082702.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 20727999 and 20728017.

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, 2524 + ... + 6915.

Almost surely, 2^20728044 is an apocalyptic number.

It is an amenable number.

20728044 is an abundant number, since it is smaller than the sum of its proper divisors (32532436).

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

20728044 is a wasteful number, since it uses less digits than its factorization.

20728044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9510 (or 9505 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20728044 is about 4552.8061676289. The cubic root of 20728044 is about 274.6962773504.

The spelling of 20728044 in words is "twenty million, seven hundred twenty-eight thousand, forty-four".