20345861195987 has 2 divisors, whose sum is σ = 20345861195988. Its totient is φ = 20345861195986.

The previous prime is 20345861195941. The next prime is 20345861196049. The reversal of 20345861195987 is 78959116854302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20345861195987 - 2⁶ = 20345861195923 is a prime.

It is not a weakly prime, because it can be changed into another prime (20345861195087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172930597993 + 10172930597994.

It is an arithmetic number, because the mean of its divisors is an integer number (10172930597994).

It is a 1-persistent number, because it is pandigital, but 2⋅20345861195987 = 40691722391974 is not.

Almost surely, 2^{20345861195987} is an apocalyptic number.

20345861195987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345861195987 is an equidigital number, since it uses as much as digits as its factorization.

20345861195987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 130636800, while the sum is 68.

The spelling of 20345861195987 in words is "twenty trillion, three hundred forty-five billion, eight hundred sixty-one million, one hundred ninety-five thousand, nine hundred eighty-seven".