20424431537 has 2 divisors, whose sum is σ = 20424431538. Its totient is φ = 20424431536.

The previous prime is 20424431527. The next prime is 20424431563. The reversal of 20424431537 is 73513442402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15924168481 + 4500263056 = 126191^2 + 67084^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424431537 - 2⁸ = 20424431281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20424431497 and 20424431506.

It is not a weakly prime, because it can be changed into another prime (20424431527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212215768 + 10212215769.

It is an arithmetic number, because the mean of its divisors is an integer number (10212215769).

Almost surely, 2^20424431537 is an apocalyptic number.

It is an amenable number.

20424431537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424431537 is an equidigital number, since it uses as much as digits as its factorization.

20424431537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 35.

Adding to 20424431537 its reverse (73513442402), we get a palindrome (93937873939).

The spelling of 20424431537 in words is "twenty billion, four hundred twenty-four million, four hundred thirty-one thousand, five hundred thirty-seven".