20045005 has 4 divisors (see below), whose sum is σ = 24054012. Its totient is φ = 16036000.

The previous prime is 20044987. The next prime is 20045017. The reversal of 20045005 is 50054002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3674889 + 16370116 = 1917^2 + 4046^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20045005 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 20045005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004496 + ... + 2004505.

It is an arithmetic number, because the mean of its divisors is an integer number (6013503).

Almost surely, 2^20045005 is an apocalyptic number.

It is an amenable number.

20045005 is a deficient number, since it is larger than the sum of its proper divisors (4009007).

20045005 is an equidigital number, since it uses as much as digits as its factorization.

20045005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009006.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20045005 is about 4477.1648394939. The cubic root of 20045005 is about 271.6452130716.

Adding to 20045005 its reverse (50054002), we get a palindrome (70099007).

The spelling of 20045005 in words is "twenty million, forty-five thousand, five".