20450005 has 4 divisors (see below), whose sum is σ = 24540012. Its totient is φ = 16360000.

The previous prime is 20449999. The next prime is 20450009. The reversal of 20450005 is 50005402.

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: 50005402 = 2 ⋅25002701.

It can be written as a sum of positive squares in 2 ways, for example, as 7193124 + 13256881 = 2682^2 + 3641^2 .

It is not a de Polignac number, because 20450005 - 2⁵ = 20449973 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 (20450009) by changing a digit.

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, 2044996 + ... + 2045005.

It is an arithmetic number, because the mean of its divisors is an integer number (6135003).

Almost surely, 2^20450005 is an apocalyptic number.

It is an amenable number.

20450005 is a deficient number, since it is larger than the sum of its proper divisors (4090007).

20450005 is an equidigital number, since it uses as much as digits as its factorization.

20450005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090006.

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

The square root of 20450005 is about 4522.1681746702. The cubic root of 20450005 is about 273.4625166010.

Adding to 20450005 its reverse (50005402), we get a palindrome (70455407).

The spelling of 20450005 in words is "twenty million, four hundred fifty thousand, five".