20430437513 has 2 divisors, whose sum is σ = 20430437514. Its totient is φ = 20430437512.

The previous prime is 20430437471. The next prime is 20430437551. The reversal of 20430437513 is 31573403402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17441956624 + 2988480889 = 132068^2 + 54667^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430437513 - 2⁶ = 20430437449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20430437513.

It is not a weakly prime, because it can be changed into another prime (20430437413) 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, 10215218756 + 10215218757.

It is an arithmetic number, because the mean of its divisors is an integer number (10215218757).

Almost surely, 2^20430437513 is an apocalyptic number.

It is an amenable number.

20430437513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430437513 is an equidigital number, since it uses as much as digits as its factorization.

20430437513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 32.

The spelling of 20430437513 in words is "twenty billion, four hundred thirty million, four hundred thirty-seven thousand, five hundred thirteen".