20201020219987 has 2 divisors, whose sum is σ = 20201020219988. Its totient is φ = 20201020219986.

The previous prime is 20201020219981. The next prime is 20201020220033. The reversal of 20201020219987 is 78991202010202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201020219987 - 2²⁷ = 20200886002259 is a prime.

It is not a weakly prime, because it can be changed into another prime (20201020219981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100510109993 + 10100510109994.

It is an arithmetic number, because the mean of its divisors is an integer number (10100510109994).

Almost surely, 2^{20201020219987} is an apocalyptic number.

20201020219987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201020219987 is an equidigital number, since it uses as much as digits as its factorization.

20201020219987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 20201020219987 in words is "twenty trillion, two hundred one billion, twenty million, two hundred nineteen thousand, nine hundred eighty-seven".