20426305 has 4 divisors (see below), whose sum is σ = 24511572. Its totient is φ = 16341040.

The previous prime is 20426297. The next prime is 20426309. The reversal of 20426305 is 50362402.

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 4112784 + 16313521 = 2028^2 + 4039^2 .

It is not a de Polignac number, because 20426305 - 2³ = 20426297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20426309) 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, 2042626 + ... + 2042635.

It is an arithmetic number, because the mean of its divisors is an integer number (6127893).

Almost surely, 2^20426305 is an apocalyptic number.

It is an amenable number.

20426305 is a deficient number, since it is larger than the sum of its proper divisors (4085267).

20426305 is an equidigital number, since it uses as much as digits as its factorization.

20426305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085266.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20426305 is about 4519.5469905733. The cubic root of 20426305 is about 273.3568350141.

Adding to 20426305 its reverse (50362402), we get a palindrome (70788707).

The spelling of 20426305 in words is "twenty million, four hundred twenty-six thousand, three hundred five".