20424002191 has 2 divisors, whose sum is σ = 20424002192. Its totient is φ = 20424002190.

The previous prime is 20424002161. The next prime is 20424002227. The reversal of 20424002191 is 19120042402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20424002191 - 2¹³ = 20423993999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424002161) 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, 10212001095 + 10212001096.

It is an arithmetic number, because the mean of its divisors is an integer number (10212001096).

Almost surely, 2^20424002191 is an apocalyptic number.

20424002191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424002191 is an equidigital number, since it uses as much as digits as its factorization.

20424002191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 20424002191 its reverse (19120042402), we get a palindrome (39544044593).

The spelling of 20424002191 in words is "twenty billion, four hundred twenty-four million, two thousand, one hundred ninety-one".