20164423043 has 2 divisors, whose sum is σ = 20164423044. Its totient is φ = 20164423042.

The previous prime is 20164423009. The next prime is 20164423049. The reversal of 20164423043 is 34032446102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20164423043 - 2⁸ = 20164422787 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20164422997 and 20164423015.

It is not a weakly prime, because it can be changed into another prime (20164423049) 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, 10082211521 + 10082211522.

It is an arithmetic number, because the mean of its divisors is an integer number (10082211522).

Almost surely, 2^20164423043 is an apocalyptic number.

20164423043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164423043 is an equidigital number, since it uses as much as digits as its factorization.

20164423043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 20164423043 its reverse (34032446102), we get a palindrome (54196869145).

The spelling of 20164423043 in words is "twenty billion, one hundred sixty-four million, four hundred twenty-three thousand, forty-three".