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20310728 = 2315231667
BaseRepresentation
bin100110101111…
…0101011001000
31102012220002012
41031132223020
520144420403
62003155052
7334431644
oct115365310
942186065
1020310728
1110512829
126975a88
1342919a9
1429a9c24
151bb2ed8
hex135eac8

20310728 has 16 divisors (see below), whose sum is σ = 38130480. Its totient is φ = 10142608.

The previous prime is 20310709. The next prime is 20310737. The reversal of 20310728 is 82701302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11351 + ... + 13017.

It is an arithmetic number, because the mean of its divisors is an integer number (2383155).

Almost surely, 220310728 is an apocalyptic number.

It is an amenable number.

20310728 is a deficient number, since it is larger than the sum of its proper divisors (17819752).

20310728 is a wasteful number, since it uses less digits than its factorization.

20310728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196 (or 3192 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20310728 is about 4506.7425042929. The cubic root of 20310728 is about 272.8402863881.

Adding to 20310728 its sum of digits (23), we get a triangular number (20310751 = T6373).

The spelling of 20310728 in words is "twenty million, three hundred ten thousand, seven hundred twenty-eight".