20728016 has 10 divisors (see below), whose sum is σ = 40160562. Its totient is φ = 10364000.

The previous prime is 20728009. The next prime is 20728033. The reversal of 20728016 is 61082702.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 2238016 = 4300^2 + 1496^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647735 + ... + 647766.

Almost surely, 2^20728016 is an apocalyptic number.

It is an amenable number.

20728016 is a deficient number, since it is larger than the sum of its proper divisors (19432546).

20728016 is a wasteful number, since it uses less digits than its factorization.

20728016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295509 (or 1295503 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20728016 is about 4552.8030926013. The cubic root of 20728016 is about 274.6961536613.

The spelling of 20728016 in words is "twenty million, seven hundred twenty-eight thousand, sixteen".