20729927 has 2 divisors, whose sum is σ = 20729928. Its totient is φ = 20729926.

The previous prime is 20729909. The next prime is 20729939. The reversal of 20729927 is 72992702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20729927 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 (20729227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364963 + 10364964.

It is an arithmetic number, because the mean of its divisors is an integer number (10364964).

Almost surely, 2^20729927 is an apocalyptic number.

20729927 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729927 is an equidigital number, since it uses as much as digits as its factorization.

20729927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20729927 is about 4553.0129584705. The cubic root of 20729927 is about 274.7045951867.

The spelling of 20729927 in words is "twenty million, seven hundred twenty-nine thousand, nine hundred twenty-seven".