20868671 has 2 divisors, whose sum is σ = 20868672. Its totient is φ = 20868670.

The previous prime is 20868667. The next prime is 20868733. The reversal of 20868671 is 17686802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20868671 - 2² = 20868667 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20868271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434335 + 10434336.

It is an arithmetic number, because the mean of its divisors is an integer number (10434336).

Almost surely, 2^20868671 is an apocalyptic number.

20868671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20868671 is an equidigital number, since it uses as much as digits as its factorization.

20868671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20868671 is about 4568.2240531743. The cubic root of 20868671 is about 275.3160927333.

The spelling of 20868671 in words is "twenty million, eight hundred sixty-eight thousand, six hundred seventy-one".