20434001243 has 2 divisors, whose sum is σ = 20434001244. Its totient is φ = 20434001242.

The previous prime is 20434001227. The next prime is 20434001249. The reversal of 20434001243 is 34210043402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20434001243 - 2⁴ = 20434001227 is a prime.

It is a nialpdrome in base 14.

It is not a weakly prime, because it can be changed into another prime (20434001249) 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, 10217000621 + 10217000622.

It is an arithmetic number, because the mean of its divisors is an integer number (10217000622).

Almost surely, 2^20434001243 is an apocalyptic number.

20434001243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434001243 is an equidigital number, since it uses as much as digits as its factorization.

20434001243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20434001243 its reverse (34210043402), we get a palindrome (54644044645).

The spelling of 20434001243 in words is "twenty billion, four hundred thirty-four million, one thousand, two hundred forty-three".