20535365171 has 4 divisors (see below), whose sum is σ = 20550388752. Its totient is φ = 20520341592.

The previous prime is 20535365117. The next prime is 20535365177. The reversal of 20535365171 is 17156353502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17156353502 = 2 ⋅8578176751.

It is a cyclic number.

It is not a de Polignac number, because 20535365171 - 2¹⁴ = 20535348787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20535365177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7509740 + ... + 7512473.

It is an arithmetic number, because the mean of its divisors is an integer number (5137597188).

Almost surely, 2^20535365171 is an apocalyptic number.

20535365171 is a deficient number, since it is larger than the sum of its proper divisors (15023581).

20535365171 is a wasteful number, since it uses less digits than its factorization.

20535365171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15023580.

The product of its (nonzero) digits is 94500, while the sum is 38.

The spelling of 20535365171 in words is "twenty billion, five hundred thirty-five million, three hundred sixty-five thousand, one hundred seventy-one".