20424220387 has 2 divisors, whose sum is σ = 20424220388. Its totient is φ = 20424220386.

The previous prime is 20424220361. The next prime is 20424220459. The reversal of 20424220387 is 78302242402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20424220387 - 2³¹ = 18276736739 is a prime.

It is not a weakly prime, because it can be changed into another prime (20424220307) 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, 10212110193 + 10212110194.

It is an arithmetic number, because the mean of its divisors is an integer number (10212110194).

Almost surely, 2^20424220387 is an apocalyptic number.

20424220387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424220387 is an equidigital number, since it uses as much as digits as its factorization.

20424220387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 34.

Adding to 20424220387 its reverse (78302242402), we get a palindrome (98726462789).

The spelling of 20424220387 in words is "twenty billion, four hundred twenty-four million, two hundred twenty thousand, three hundred eighty-seven".