20430432437 has 2 divisors, whose sum is σ = 20430432438. Its totient is φ = 20430432436.

The previous prime is 20430432383. The next prime is 20430432443. The reversal of 20430432437 is 73423403402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17257814161 + 3172618276 = 131369^2 + 56326^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430432437 - 2²⁶ = 20363323573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20430432467) 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, 10215216218 + 10215216219.

It is an arithmetic number, because the mean of its divisors is an integer number (10215216219).

Almost surely, 2^20430432437 is an apocalyptic number.

It is an amenable number.

20430432437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430432437 is an equidigital number, since it uses as much as digits as its factorization.

20430432437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 32.

Adding to 20430432437 its reverse (73423403402), we get a palindrome (93853835839).

The spelling of 20430432437 in words is "twenty billion, four hundred thirty million, four hundred thirty-two thousand, four hundred thirty-seven".