20731065 has 16 divisors (see below), whose sum is σ = 33384768. Its totient is φ = 10984896.

The previous prime is 20731057. The next prime is 20731069. The reversal of 20731065 is 56013702.

It is not a de Polignac number, because 20731065 - 2³ = 20731057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20731069) 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 15 ways as a sum of consecutive naturals, for example, 2047 + ... + 6756.

It is an arithmetic number, because the mean of its divisors is an integer number (2086548).

Almost surely, 2^20731065 is an apocalyptic number.

It is an amenable number.

20731065 is a deficient number, since it is larger than the sum of its proper divisors (12653703).

20731065 is a wasteful number, since it uses less digits than its factorization.

20731065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8968.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20731065 is about 4553.1379289453. The cubic root of 20731065 is about 274.7096218664.

Adding to 20731065 its reverse (56013702), we get a palindrome (76744767).

The spelling of 20731065 in words is "twenty million, seven hundred thirty-one thousand, sixty-five".