20001230309993 has 2 divisors, whose sum is σ = 20001230309994. Its totient is φ = 20001230309992.

The previous prime is 20001230309869. The next prime is 20001230310049. The reversal of 20001230309993 is 39990303210002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19858458176089 + 142772133904 = 4456283^2 + 377852^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001230309993 - 2²⁴ = 20001213532777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20001230309993.

It is not a weakly prime, because it can be changed into another prime (20001230309393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000615154996 + 10000615154997.

It is an arithmetic number, because the mean of its divisors is an integer number (10000615154997).

Almost surely, 2^{20001230309993} is an apocalyptic number.

It is an amenable number.

20001230309993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001230309993 is an equidigital number, since it uses as much as digits as its factorization.

20001230309993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 41.

Adding to 20001230309993 its reverse (39990303210002), we get a palindrome (59991533519995).

The spelling of 20001230309993 in words is "twenty trillion, one billion, two hundred thirty million, three hundred nine thousand, nine hundred ninety-three".