20000017249987 has 2 divisors, whose sum is σ = 20000017249988. Its totient is φ = 20000017249986.

The previous prime is 20000017249973. The next prime is 20000017250023. The reversal of 20000017249987 is 78994271000002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20000017249987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20000017249987.

It is not a weakly prime, because it can be changed into another prime (20000017249967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000008624993 + 10000008624994.

It is an arithmetic number, because the mean of its divisors is an integer number (10000008624994).

Almost surely, 2^{20000017249987} is an apocalyptic number.

20000017249987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000017249987 is an equidigital number, since it uses as much as digits as its factorization.

20000017249987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

Adding to 20000017249987 its reverse (78994271000002), we get a palindrome (98994288249989).

The spelling of 20000017249987 in words is "twenty trillion, seventeen million, two hundred forty-nine thousand, nine hundred eighty-seven".