20739671 has 2 divisors, whose sum is σ = 20739672. Its totient is φ = 20739670.

The previous prime is 20739661. The next prime is 20739679. The reversal of 20739671 is 17693702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20739671 - 2¹⁰ = 20738647 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 (20739679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369835 + 10369836.

It is an arithmetic number, because the mean of its divisors is an integer number (10369836).

Almost surely, 2^20739671 is an apocalyptic number.

20739671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20739671 is an equidigital number, since it uses as much as digits as its factorization.

20739671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20739671 is about 4554.0828934046. The cubic root of 20739671 is about 274.7476296249.

The spelling of 20739671 in words is "twenty million, seven hundred thirty-nine thousand, six hundred seventy-one".