20080645 has 8 divisors (see below), whose sum is σ = 25950456. Its totient is φ = 14828736.

The previous prime is 20080589. The next prime is 20080661. The reversal of 20080645 is 54608002.

It can be written as a sum of positive squares in 4 ways, for example, as 349281 + 19731364 = 591^2 + 4442^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20080645 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154402 + ... + 154531.

It is an arithmetic number, because the mean of its divisors is an integer number (3243807).

Almost surely, 2^20080645 is an apocalyptic number.

It is an amenable number.

20080645 is a deficient number, since it is larger than the sum of its proper divisors (5869811).

20080645 is a wasteful number, since it uses less digits than its factorization.

20080645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308951.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20080645 is about 4481.1432693008. The cubic root of 20080645 is about 271.8061127270.

Adding to 20080645 its reverse (54608002), we get a palindrome (74688647).

The spelling of 20080645 in words is "twenty million, eighty thousand, six hundred forty-five".