20320634731 has 2 divisors, whose sum is σ = 20320634732. Its totient is φ = 20320634730.

The previous prime is 20320634713. The next prime is 20320634749. The reversal of 20320634731 is 13743602302.

Together with previous prime (20320634713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (20320634713) and next prime (20320634749).

It is a cyclic number.

It is not a de Polignac number, because 20320634731 - 2⁹ = 20320634219 is a prime.

It is a super-2 number, since 2×20320634731² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20320634693 and 20320634702.

It is not a weakly prime, because it can be changed into another prime (20320634791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160317365 + 10160317366.

It is an arithmetic number, because the mean of its divisors is an integer number (10160317366).

Almost surely, 2^20320634731 is an apocalyptic number.

20320634731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320634731 is an equidigital number, since it uses as much as digits as its factorization.

20320634731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 31.

The spelling of 20320634731 in words is "twenty billion, three hundred twenty million, six hundred thirty-four thousand, seven hundred thirty-one".