20343784243 has 2 divisors, whose sum is σ = 20343784244. Its totient is φ = 20343784242.

The previous prime is 20343784147. The next prime is 20343784261. The reversal of 20343784243 is 34248734302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20343784243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20343784196 and 20343784205.

It is not a weakly prime, because it can be changed into another prime (20343784343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171892121 + 10171892122.

It is an arithmetic number, because the mean of its divisors is an integer number (10171892122).

Almost surely, 2^20343784243 is an apocalyptic number.

20343784243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20343784243 is an equidigital number, since it uses as much as digits as its factorization.

20343784243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 40.

The spelling of 20343784243 in words is "twenty billion, three hundred forty-three million, seven hundred eighty-four thousand, two hundred forty-three".