20631041 has 4 divisors (see below), whose sum is σ = 20913732. Its totient is φ = 20348352.

The previous prime is 20631031. The next prime is 20631043. The reversal of 20631041 is 14013602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5452225 + 15178816 = 2335^2 + 3896^2 .

It is a cyclic number.

It is not a de Polignac number, because 20631041 - 2¹⁸ = 20368897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20631043) 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 3 ways as a sum of consecutive naturals, for example, 141236 + ... + 141381.

It is an arithmetic number, because the mean of its divisors is an integer number (5228433).

Almost surely, 2^20631041 is an apocalyptic number.

It is an amenable number.

20631041 is a deficient number, since it is larger than the sum of its proper divisors (282691).

20631041 is an equidigital number, since it uses as much as digits as its factorization.

20631041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282690.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20631041 is about 4542.1405746630. The cubic root of 20631041 is about 274.2670997283.

Adding to 20631041 its reverse (14013602), we get a palindrome (34644643).

The spelling of 20631041 in words is "twenty million, six hundred thirty-one thousand, forty-one".