20743381693 has 2 divisors, whose sum is σ = 20743381694. Its totient is φ = 20743381692.

The previous prime is 20743381661. The next prime is 20743381741. The reversal of 20743381693 is 39618334702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17290409049 + 3452972644 = 131493^2 + 58762^2 .

It is a cyclic number.

It is not a de Polignac number, because 20743381693 - 2⁵ = 20743381661 is a prime.

It is a super-2 number, since 2×20743381693² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20743381193) 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, 10371690846 + 10371690847.

It is an arithmetic number, because the mean of its divisors is an integer number (10371690847).

Almost surely, 2^20743381693 is an apocalyptic number.

It is an amenable number.

20743381693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20743381693 is an equidigital number, since it uses as much as digits as its factorization.

20743381693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 20743381693 in words is "twenty billion, seven hundred forty-three million, three hundred eighty-one thousand, six hundred ninety-three".