20689883 has 2 divisors, whose sum is σ = 20689884. Its totient is φ = 20689882.

The previous prime is 20689873. The next prime is 20689891. The reversal of 20689883 is 38898602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20689883 - 2⁶ = 20689819 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20689813) 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, 10344941 + 10344942.

It is an arithmetic number, because the mean of its divisors is an integer number (10344942).

Almost surely, 2^20689883 is an apocalyptic number.

20689883 is a deficient number, since it is larger than the sum of its proper divisors (1).

20689883 is an equidigital number, since it uses as much as digits as its factorization.

20689883 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 20689883 is about 4548.6133051733. The cubic root of 20689883 is about 274.5275988809.

The spelling of 20689883 in words is "twenty million, six hundred eighty-nine thousand, eight hundred eighty-three".