20678159 has 2 divisors, whose sum is σ = 20678160. Its totient is φ = 20678158.

The previous prime is 20678149. The next prime is 20678179. The reversal of 20678159 is 95187602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20678159 - 2⁸ = 20677903 is a prime.

It is a Sophie Germain 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 (20678149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339079 + 10339080.

It is an arithmetic number, because the mean of its divisors is an integer number (10339080).

Almost surely, 2^20678159 is an apocalyptic number.

20678159 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678159 is an equidigital number, since it uses as much as digits as its factorization.

20678159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 20678159 is about 4547.3243781371. The cubic root of 20678159 is about 274.4757350513.

The spelling of 20678159 in words is "twenty million, six hundred seventy-eight thousand, one hundred fifty-nine".