20201686336109 has 2 divisors, whose sum is σ = 20201686336110. Its totient is φ = 20201686336108.

The previous prime is 20201686336099. The next prime is 20201686336127. The reversal of 20201686336109 is 90163368610202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15100389790084 + 5101296546025 = 3885922^2 + 2258605^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201686336109 - 2²⁰ = 20201685287533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201686336609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100843168054 + 10100843168055.

It is an arithmetic number, because the mean of its divisors is an integer number (10100843168055).

Almost surely, 2^{20201686336109} is an apocalyptic number.

It is an amenable number.

20201686336109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201686336109 is an equidigital number, since it uses as much as digits as its factorization.

20201686336109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 20201686336109 in words is "twenty trillion, two hundred one billion, six hundred eighty-six million, three hundred thirty-six thousand, one hundred nine".