20530265342987 has 2 divisors, whose sum is σ = 20530265342988. Its totient is φ = 20530265342986.

The previous prime is 20530265342959. The next prime is 20530265343017. The reversal of 20530265342987 is 78924356203502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20530265342987 is a prime.

It is not a weakly prime, because it can be changed into another prime (20530265342957) 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, 10265132671493 + 10265132671494.

It is an arithmetic number, because the mean of its divisors is an integer number (10265132671494).

Almost surely, 2^{20530265342987} is an apocalyptic number.

20530265342987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530265342987 is an equidigital number, since it uses as much as digits as its factorization.

20530265342987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 20530265342987 in words is "twenty trillion, five hundred thirty billion, two hundred sixty-five million, three hundred forty-two thousand, nine hundred eighty-seven".