20433312173 has 2 divisors, whose sum is σ = 20433312174. Its totient is φ = 20433312172.

The previous prime is 20433312169. The next prime is 20433312199. The reversal of 20433312173 is 37121333402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20432415364 + 896809 = 142942^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 20433312173 - 2² = 20433312169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20433312103) 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, 10216656086 + 10216656087.

It is an arithmetic number, because the mean of its divisors is an integer number (10216656087).

Almost surely, 2^20433312173 is an apocalyptic number.

It is an amenable number.

20433312173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20433312173 is an equidigital number, since it uses as much as digits as its factorization.

20433312173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 29.

Adding to 20433312173 its reverse (37121333402), we get a palindrome (57554645575).

The spelling of 20433312173 in words is "twenty billion, four hundred thirty-three million, three hundred twelve thousand, one hundred seventy-three".