20404342243 has 2 divisors, whose sum is σ = 20404342244. Its totient is φ = 20404342242.

The previous prime is 20404342229. The next prime is 20404342279. The reversal of 20404342243 is 34224340402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404342243 - 2⁹ = 20404341731 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404342213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202171121 + 10202171122.

It is an arithmetic number, because the mean of its divisors is an integer number (10202171122).

Almost surely, 2^20404342243 is an apocalyptic number.

20404342243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404342243 is an equidigital number, since it uses as much as digits as its factorization.

20404342243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 20404342243 its reverse (34224340402), we get a palindrome (54628682645).

The spelling of 20404342243 in words is "twenty billion, four hundred four million, three hundred forty-two thousand, two hundred forty-three".