20201020211987 has 2 divisors, whose sum is σ = 20201020211988. Its totient is φ = 20201020211986.

The previous prime is 20201020211971. The next prime is 20201020212017. The reversal of 20201020211987 is 78911202010202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201020211987 - 2⁴ = 20201020211971 is a prime.

It is not a weakly prime, because it can be changed into another prime (20201020219987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100510105993 + 10100510105994.

It is an arithmetic number, because the mean of its divisors is an integer number (10100510105994).

Almost surely, 2^{20201020211987} is an apocalyptic number.

20201020211987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201020211987 is an equidigital number, since it uses as much as digits as its factorization.

20201020211987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The spelling of 20201020211987 in words is "twenty trillion, two hundred one billion, twenty million, two hundred eleven thousand, nine hundred eighty-seven".