20731041 has 12 divisors (see below), whose sum is σ = 31706532. Its totient is φ = 13007616.

The previous prime is 20731001. The next prime is 20731043. The reversal of 20731041 is 14013702.

It can be written as a sum of positive squares in 2 ways, for example, as 13950225 + 6780816 = 3735^2 + 2604^2 .

It is not a de Polignac number, because 20731041 - 2⁹ = 20730529 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731043) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 67596 + ... + 67901.

It is an arithmetic number, because the mean of its divisors is an integer number (2642211).

Almost surely, 2^20731041 is an apocalyptic number.

It is an amenable number.

20731041 is a deficient number, since it is larger than the sum of its proper divisors (10975491).

20731041 is a wasteful number, since it uses less digits than its factorization.

20731041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135520 (or 135517 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20731041 is about 4553.1352933995. The cubic root of 20731041 is about 274.7095158574.

Adding to 20731041 its reverse (14013702), we get a palindrome (34744743).

The spelling of 20731041 in words is "twenty million, seven hundred thirty-one thousand, forty-one".