20676871 has 2 divisors, whose sum is σ = 20676872. Its totient is φ = 20676870.

The previous prime is 20676869. The next prime is 20676889. The reversal of 20676871 is 17867602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20676871 - 2¹ = 20676869 is a prime.

Together with 20676869, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20676871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20676371) 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, 10338435 + 10338436.

It is an arithmetic number, because the mean of its divisors is an integer number (10338436).

Almost surely, 2^20676871 is an apocalyptic number.

20676871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20676871 is an equidigital number, since it uses as much as digits as its factorization.

20676871 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20676871 is about 4547.1827541897. The cubic root of 20676871 is about 274.4700360899.

It can be divided in two parts, 206 and 76871, that added together give a palindrome (77077).

The spelling of 20676871 in words is "twenty million, six hundred seventy-six thousand, eight hundred seventy-one".