20728007 has 8 divisors (see below), whose sum is σ = 20975280. Its totient is φ = 20482560.

The previous prime is 20727989. The next prime is 20728009. The reversal of 20728007 is 70082702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20728007 - 2²⁰ = 19679431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728009) 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, 40469 + ... + 40977.

It is an arithmetic number, because the mean of its divisors is an integer number (2621910).

Almost surely, 2^20728007 is an apocalyptic number.

20728007 is a deficient number, since it is larger than the sum of its proper divisors (247273).

20728007 is a wasteful number, since it uses less digits than its factorization.

20728007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20728007 is about 4552.8021041991. The cubic root of 20728007 is about 274.6961139041.

The spelling of 20728007 in words is "twenty million, seven hundred twenty-eight thousand, seven".