20676889 has 2 divisors, whose sum is σ = 20676890. Its totient is φ = 20676888.

The previous prime is 20676871. The next prime is 20676893. The reversal of 20676889 is 98867602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 1710864 = 4355^2 + 1308^2 .

It is a cyclic number.

It is not a de Polignac number, because 20676889 - 2¹⁷ = 20545817 is a prime.

It is not a weakly prime, because it can be changed into another prime (20676809) 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, 10338444 + 10338445.

It is an arithmetic number, because the mean of its divisors is an integer number (10338445).

Almost surely, 2^20676889 is an apocalyptic number.

It is an amenable number.

20676889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20676889 is an equidigital number, since it uses as much as digits as its factorization.

20676889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 20676889 is about 4547.1847334367. The cubic root of 20676889 is about 274.4701157354.

The spelling of 20676889 in words is "twenty million, six hundred seventy-six thousand, eight hundred eighty-nine".