20321067631 has 4 divisors (see below), whose sum is σ = 20321446672. Its totient is φ = 20320688592.

The previous prime is 20321067629. The next prime is 20321067649. The reversal of 20321067631 is 13676012302.

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

It is a cyclic number.

It is not a de Polignac number, because 20321067631 - 2¹ = 20321067629 is a prime.

It is a super-2 number, since 2×20321067631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20321067593 and 20321067602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321068631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92571 + ... + 221836.

It is an arithmetic number, because the mean of its divisors is an integer number (5080361668).

Almost surely, 2^20321067631 is an apocalyptic number.

20321067631 is a deficient number, since it is larger than the sum of its proper divisors (379041).

20321067631 is an equidigital number, since it uses as much as digits as its factorization.

20321067631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379040.

The product of its (nonzero) digits is 9072, while the sum is 31.

Adding to 20321067631 its reverse (13676012302), we get a palindrome (33997079933).

The spelling of 20321067631 in words is "twenty billion, three hundred twenty-one million, sixty-seven thousand, six hundred thirty-one".