20424009391 has 2 divisors, whose sum is σ = 20424009392. Its totient is φ = 20424009390.

The previous prime is 20424009349. The next prime is 20424009421. The reversal of 20424009391 is 19390042402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20424009391 - 2¹⁵ = 20423976623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424009301) 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, 10212004695 + 10212004696.

It is an arithmetic number, because the mean of its divisors is an integer number (10212004696).

Almost surely, 2^20424009391 is an apocalyptic number.

20424009391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424009391 is an equidigital number, since it uses as much as digits as its factorization.

20424009391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 20424009391 in words is "twenty billion, four hundred twenty-four million, nine thousand, three hundred ninety-one".