20728714 has 4 divisors (see below), whose sum is σ = 31093074. Its totient is φ = 10364356.

The previous prime is 20728699. The next prime is 20728717. The reversal of 20728714 is 41782702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20548089 + 180625 = 4533^2 + 425^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20728717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5182177 + ... + 5182180.

Almost surely, 2^20728714 is an apocalyptic number.

20728714 is a deficient number, since it is larger than the sum of its proper divisors (10364360).

20728714 is a wasteful number, since it uses less digits than its factorization.

20728714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364359.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 20728714 is about 4552.8797480276. The cubic root of 20728714 is about 274.6992370206.

The spelling of 20728714 in words is "twenty million, seven hundred twenty-eight thousand, seven hundred fourteen".