20869159 has 2 divisors, whose sum is σ = 20869160. Its totient is φ = 20869158.

The previous prime is 20869157. The next prime is 20869181. The reversal of 20869159 is 95196802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20869159 - 2¹ = 20869157 is a prime.

Together with 20869157, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20869151) 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, 10434579 + 10434580.

It is an arithmetic number, because the mean of its divisors is an integer number (10434580).

Almost surely, 2^20869159 is an apocalyptic number.

20869159 is a deficient number, since it is larger than the sum of its proper divisors (1).

20869159 is an equidigital number, since it uses as much as digits as its factorization.

20869159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 20869159 is about 4568.2774653035. The cubic root of 20869159 is about 275.3182387445.

The spelling of 20869159 in words is "twenty million, eight hundred sixty-nine thousand, one hundred fifty-nine".