20728927 has 4 divisors (see below), whose sum is σ = 21170016. Its totient is φ = 20287840.

The previous prime is 20728921. The next prime is 20728949. The reversal of 20728927 is 72982702.

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

It is a cyclic number.

It is not a de Polignac number, because 20728927 - 2³ = 20728919 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 (20728921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220474 + ... + 220567.

It is an arithmetic number, because the mean of its divisors is an integer number (5292504).

Almost surely, 2^20728927 is an apocalyptic number.

20728927 is a deficient number, since it is larger than the sum of its proper divisors (441089).

20728927 is an equidigital number, since it uses as much as digits as its factorization.

20728927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441088.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20728927 is about 4552.9031397560. The cubic root of 20728927 is about 274.7001779173.

The spelling of 20728927 in words is "twenty million, seven hundred twenty-eight thousand, nine hundred twenty-seven".