20728683 has 8 divisors (see below), whose sum is σ = 30709200. Its totient is φ = 13819104.

The previous prime is 20728637. The next prime is 20728691. The reversal of 20728683 is 38682702.

It is a happy number.

It is not a de Polignac number, because 20728683 - 2⁶ = 20728619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20728633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383838 + ... + 383891.

It is an arithmetic number, because the mean of its divisors is an integer number (3838650).

Almost surely, 2^20728683 is an apocalyptic number.

20728683 is a deficient number, since it is larger than the sum of its proper divisors (9980517).

20728683 is an equidigital number, since it uses as much as digits as its factorization.

20728683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767738 (or 767732 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20728683 is about 4552.8763435876. The cubic root of 20728683 is about 274.6991000821.

The spelling of 20728683 in words is "twenty million, seven hundred twenty-eight thousand, six hundred eighty-three".