20001243473 has 2 divisors, whose sum is σ = 20001243474. Its totient is φ = 20001243472.

The previous prime is 20001243391. The next prime is 20001243491. The reversal of 20001243473 is 37434210002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14989594624 + 5011648849 = 122432^2 + 70793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001243473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001243373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000621736 + 10000621737.

It is an arithmetic number, because the mean of its divisors is an integer number (10000621737).

Almost surely, 2^20001243473 is an apocalyptic number.

It is an amenable number.

20001243473 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001243473 is an equidigital number, since it uses as much as digits as its factorization.

20001243473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 26.

Adding to 20001243473 its reverse (37434210002), we get a palindrome (57435453475).

The spelling of 20001243473 in words is "twenty billion, one million, two hundred forty-three thousand, four hundred seventy-three".