20320065 has 40 divisors (see below), whose sum is σ = 36799488. Its totient is φ = 10726560.

The previous prime is 20320057. The next prime is 20320073. The reversal of 20320065 is 56002302.

It is an interprime number because it is at equal distance from previous prime (20320057) and next prime (20320073).

It is not a de Polignac number, because 20320065 - 2³ = 20320057 is a prime.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 52864 + ... + 53246.

Almost surely, 2^20320065 is an apocalyptic number.

It is an amenable number.

20320065 is a deficient number, since it is larger than the sum of its proper divisors (16479423).

20320065 is a wasteful number, since it uses less digits than its factorization.

20320065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 522 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20320065 is about 4507.7782775997. The cubic root of 20320065 is about 272.8820889187.

Adding to 20320065 its reverse (56002302), we get a palindrome (76322367).

The spelling of 20320065 in words is "twenty million, three hundred twenty thousand, sixty-five".