20108005 has 4 divisors (see below), whose sum is σ = 24129612. Its totient is φ = 16086400.

The previous prime is 20107951. The next prime is 20108009. The reversal of 20108005 is 50080102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50080102 = 2 ⋅25040051.

It can be written as a sum of positive squares in 2 ways, for example, as 14730244 + 5377761 = 3838^2 + 2319^2 .

It is not a de Polignac number, because 20108005 - 2⁷ = 20107877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20108005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108009) 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, 2010796 + ... + 2010805.

It is an arithmetic number, because the mean of its divisors is an integer number (6032403).

Almost surely, 2^20108005 is an apocalyptic number.

It is an amenable number.

20108005 is a deficient number, since it is larger than the sum of its proper divisors (4021607).

20108005 is an equidigital number, since it uses as much as digits as its factorization.

20108005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021606.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20108005 is about 4484.1950225208. The cubic root of 20108005 is about 271.9295025272.

Adding to 20108005 its reverse (50080102), we get a palindrome (70188107).

The spelling of 20108005 in words is "twenty million, one hundred eight thousand, five".