20195159 has 4 divisors (see below), whose sum is σ = 20354304. Its totient is φ = 20036016.

The previous prime is 20195137. The next prime is 20195177. The reversal of 20195159 is 95159102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95159102 = 2 ⋅47579551.

It is a cyclic number.

It is not a de Polignac number, because 20195159 - 2⁸ = 20194903 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 (20195179) 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 in 3 ways as a sum of consecutive naturals, for example, 79382 + ... + 79635.

It is an arithmetic number, because the mean of its divisors is an integer number (5088576).

Almost surely, 2^20195159 is an apocalyptic number.

20195159 is a deficient number, since it is larger than the sum of its proper divisors (159145).

20195159 is a wasteful number, since it uses less digits than its factorization.

20195159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159144.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 20195159 is about 4493.9024243969. The cubic root of 20195159 is about 272.3218103921.

The spelling of 20195159 in words is "twenty million, one hundred ninety-five thousand, one hundred fifty-nine".