20404534243 has 2 divisors, whose sum is σ = 20404534244. Its totient is φ = 20404534242.

The previous prime is 20404534237. The next prime is 20404534259. The reversal of 20404534243 is 34243540402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404534243 - 2³³ = 11814599651 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404534643) 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, 10202267121 + 10202267122.

It is an arithmetic number, because the mean of its divisors is an integer number (10202267122).

Almost surely, 2^20404534243 is an apocalyptic number.

20404534243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404534243 is an equidigital number, since it uses as much as digits as its factorization.

20404534243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 31.

The spelling of 20404534243 in words is "twenty billion, four hundred four million, five hundred thirty-four thousand, two hundred forty-three".