20159911 has 2 divisors, whose sum is σ = 20159912. Its totient is φ = 20159910.

The previous prime is 20159897. The next prime is 20159917. The reversal of 20159911 is 11995102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20159911 - 2¹⁵ = 20127143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20159911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20159917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10079955 + 10079956.

It is an arithmetic number, because the mean of its divisors is an integer number (10079956).

Almost surely, 2^20159911 is an apocalyptic number.

20159911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20159911 is an equidigital number, since it uses as much as digits as its factorization.

20159911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 20159911 is about 4489.9789531801. The cubic root of 20159911 is about 272.1632841321.

The spelling of 20159911 in words is "twenty million, one hundred fifty-nine thousand, nine hundred eleven".