20622242641993 has 2 divisors, whose sum is σ = 20622242641994. Its totient is φ = 20622242641992.

The previous prime is 20622242641981. The next prime is 20622242642059. The reversal of 20622242641993 is 39914624222602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12280728245769 + 8341514396224 = 3504387^2 + 2888168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20622242641993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20622242641993.

It is not a weakly prime, because it can be changed into another prime (20622242641093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311121320996 + 10311121320997.

It is an arithmetic number, because the mean of its divisors is an integer number (10311121320997).

Almost surely, 2^{20622242641993} is an apocalyptic number.

It is an amenable number.

20622242641993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20622242641993 is an equidigital number, since it uses as much as digits as its factorization.

20622242641993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 52.

The spelling of 20622242641993 in words is "twenty trillion, six hundred twenty-two billion, two hundred forty-two million, six hundred forty-one thousand, nine hundred ninety-three".