20717927 has 2 divisors, whose sum is σ = 20717928. Its totient is φ = 20717926.

The previous prime is 20717903. The next prime is 20717947. The reversal of 20717927 is 72971702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20717927 - 2⁶ = 20717863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20717947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10358963 + 10358964.

It is an arithmetic number, because the mean of its divisors is an integer number (10358964).

Almost surely, 2^20717927 is an apocalyptic number.

20717927 is a deficient number, since it is larger than the sum of its proper divisors (1).

20717927 is an equidigital number, since it uses as much as digits as its factorization.

20717927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 20717927 is about 4551.6949590235. The cubic root of 20717927 is about 274.6515785757.

The spelling of 20717927 in words is "twenty million, seven hundred seventeen thousand, nine hundred twenty-seven".