20880005 has 4 divisors (see below), whose sum is σ = 25056012. Its totient is φ = 16704000.

The previous prime is 20880001. The next prime is 20880007. The reversal of 20880005 is 50008802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50008802 = 2 ⋅25004401.

It can be written as a sum of positive squares in 2 ways, for example, as 8755681 + 12124324 = 2959^2 + 3482^2 .

It is not a de Polignac number, because 20880005 - 2² = 20880001 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 (20880001) 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, 2087996 + ... + 2088005.

It is an arithmetic number, because the mean of its divisors is an integer number (6264003).

Almost surely, 2^20880005 is an apocalyptic number.

It is an amenable number.

20880005 is a deficient number, since it is larger than the sum of its proper divisors (4176007).

20880005 is an equidigital number, since it uses as much as digits as its factorization.

20880005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176006.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 20880005 is about 4569.4644106284. The cubic root of 20880005 is about 275.3659260912.

Adding to 20880005 its reverse (50008802), we get a palindrome (70888807).

The spelling of 20880005 in words is "twenty million, eight hundred eighty thousand, five".