20317105 has 4 divisors (see below), whose sum is σ = 24380532. Its totient is φ = 16253680.

The previous prime is 20317093. The next prime is 20317127. The reversal of 20317105 is 50171302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50171302 = 2 ⋅25085651.

It can be written as a sum of positive squares in 2 ways, for example, as 15547249 + 4769856 = 3943^2 + 2184^2 .

It is not a de Polignac number, because 20317105 - 2⁷ = 20316977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2031706 + ... + 2031715.

It is an arithmetic number, because the mean of its divisors is an integer number (6095133).

Almost surely, 2^20317105 is an apocalyptic number.

It is an amenable number.

20317105 is a deficient number, since it is larger than the sum of its proper divisors (4063427).

20317105 is an equidigital number, since it uses as much as digits as its factorization.

20317105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063426.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20317105 is about 4507.4499442589. The cubic root of 20317105 is about 272.8688381375.

Adding to 20317105 its reverse (50171302), we get a palindrome (70488407).

The spelling of 20317105 in words is "twenty million, three hundred seventeen thousand, one hundred five".