20159791 has 4 divisors (see below), whose sum is σ = 20172400. Its totient is φ = 20147184.

The previous prime is 20159771. The next prime is 20159809. The reversal of 20159791 is 19795102.

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 20159791 - 2¹¹ = 20157743 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 (20159761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3486 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (5043100).

Almost surely, 2^20159791 is an apocalyptic number.

20159791 is a deficient number, since it is larger than the sum of its proper divisors (12609).

20159791 is a wasteful number, since it uses less digits than its factorization.

20159791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12608.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 20159791 is about 4489.9655900686. The cubic root of 20159791 is about 272.1627441222.

The spelling of 20159791 in words is "twenty million, one hundred fifty-nine thousand, seven hundred ninety-one".