20936159 has 4 divisors (see below), whose sum is σ = 20975400. Its totient is φ = 20896920.

The previous prime is 20936137. The next prime is 20936171. The reversal of 20936159 is 95163902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20936159 - 2⁸ = 20935903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20936059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18809 + ... + 19890.

It is an arithmetic number, because the mean of its divisors is an integer number (5243850).

Almost surely, 2^20936159 is an apocalyptic number.

20936159 is a deficient number, since it is larger than the sum of its proper divisors (39241).

20936159 is an equidigital number, since it uses as much as digits as its factorization.

20936159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39240.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 20936159 is about 4575.6047687710. The cubic root of 20936159 is about 275.6125584887.

The spelling of 20936159 in words is "twenty million, nine hundred thirty-six thousand, one hundred fifty-nine".