20201686510823 has 2 divisors, whose sum is σ = 20201686510824. Its totient is φ = 20201686510822.

The previous prime is 20201686510801. The next prime is 20201686510847. The reversal of 20201686510823 is 32801568610202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201686510823 - 2¹⁰ = 20201686509799 is a prime.

It is a super-2 number, since 2×20201686510823² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201686510853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100843255411 + 10100843255412.

It is an arithmetic number, because the mean of its divisors is an integer number (10100843255412).

Almost surely, 2^{20201686510823} is an apocalyptic number.

20201686510823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201686510823 is an equidigital number, since it uses as much as digits as its factorization.

20201686510823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 20201686510823 in words is "twenty trillion, two hundred one billion, six hundred eighty-six million, five hundred ten thousand, eight hundred twenty-three".