20430539 has 2 divisors, whose sum is σ = 20430540. Its totient is φ = 20430538.

The previous prime is 20430517. The next prime is 20430541. The reversal of 20430539 is 93503402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20430539 - 2¹² = 20426443 is a prime.

Together with 20430541, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1296143 and since 20430539 and 1296143 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20430589) 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, 10215269 + 10215270.

It is an arithmetic number, because the mean of its divisors is an integer number (10215270).

Almost surely, 2^20430539 is an apocalyptic number.

20430539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430539 is an equidigital number, since it uses as much as digits as its factorization.

20430539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20430539 is about 4520.0153760800. The cubic root of 20430539 is about 273.3757210025.

The spelling of 20430539 in words is "twenty million, four hundred thirty thousand, five hundred thirty-nine".