20312605 has 4 divisors (see below), whose sum is σ = 24375132. Its totient is φ = 16250080.

The previous prime is 20312597. The next prime is 20312623. The reversal of 20312605 is 50621302.

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: 50621302 = 2 ⋅25310651.

It can be written as a sum of positive squares in 2 ways, for example, as 3755844 + 16556761 = 1938^2 + 4069^2 .

It is not a de Polignac number, because 20312605 - 2³ = 20312597 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 3 ways as a sum of consecutive naturals, for example, 2031256 + ... + 2031265.

It is an arithmetic number, because the mean of its divisors is an integer number (6093783).

Almost surely, 2^20312605 is an apocalyptic number.

It is an amenable number.

20312605 is a deficient number, since it is larger than the sum of its proper divisors (4062527).

20312605 is an equidigital number, since it uses as much as digits as its factorization.

20312605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062526.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20312605 is about 4506.9507430191. The cubic root of 20312605 is about 272.8486909029.

Adding to 20312605 its reverse (50621302), we get a palindrome (70933907).

The spelling of 20312605 in words is "twenty million, three hundred twelve thousand, six hundred five".