20001019993 has 2 divisors, whose sum is σ = 20001019994. Its totient is φ = 20001019992.

The previous prime is 20001019963. The next prime is 20001020003. The reversal of 20001019993 is 39991010002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13157925264 + 6843094729 = 114708^2 + 82723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001019993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001019933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000509996 + 10000509997.

It is an arithmetic number, because the mean of its divisors is an integer number (10000509997).

Almost surely, 2^20001019993 is an apocalyptic number.

It is an amenable number.

20001019993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001019993 is an equidigital number, since it uses as much as digits as its factorization.

20001019993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 34.

Adding to 20001019993 its reverse (39991010002), we get a palindrome (59992029995).

The spelling of 20001019993 in words is "twenty billion, one million, nineteen thousand, nine hundred ninety-three".