20631065 has 16 divisors (see below), whose sum is σ = 30471168. Its totient is φ = 13058496.

The previous prime is 20631043. The next prime is 20631097. The reversal of 20631065 is 56013602.

It is a cyclic number.

It is not a de Polignac number, because 20631065 - 2¹⁰ = 20630041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20631065.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22217 + ... + 23126.

It is an arithmetic number, because the mean of its divisors is an integer number (1904448).

Almost surely, 2^20631065 is an apocalyptic number.

It is an amenable number.

20631065 is a deficient number, since it is larger than the sum of its proper divisors (9840103).

20631065 is a wasteful number, since it uses less digits than its factorization.

20631065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45368.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20631065 is about 4542.1432165884. The cubic root of 20631065 is about 274.2672060795.

Adding to 20631065 its reverse (56013602), we get a palindrome (76644667).

The spelling of 20631065 in words is "twenty million, six hundred thirty-one thousand, sixty-five".