20631841 has 4 divisors (see below), whose sum is σ = 20763412. Its totient is φ = 20500272.

The previous prime is 20631823. The next prime is 20631857. The reversal of 20631841 is 14813602.

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 12931216 + 7700625 = 3596^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 20631841 - 2¹¹ = 20629793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20631641) 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, 65550 + ... + 65863.

It is an arithmetic number, because the mean of its divisors is an integer number (5190853).

Almost surely, 2^20631841 is an apocalyptic number.

It is an amenable number.

20631841 is a deficient number, since it is larger than the sum of its proper divisors (131571).

20631841 is a wasteful number, since it uses less digits than its factorization.

20631841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131570.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20631841 is about 4542.2286380146. The cubic root of 20631841 is about 274.2706447238.

The spelling of 20631841 in words is "twenty million, six hundred thirty-one thousand, eight hundred forty-one".