20620572022171 has 4 divisors (see below), whose sum is σ = 22495169478744. Its totient is φ = 18745974565600.

The previous prime is 20620572022163. The next prime is 20620572022217. The reversal of 20620572022171 is 17122027502602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20620572022171 - 2³ = 20620572022163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20620572022171.

It is not an unprimeable number, because it can be changed into a prime (20620572025171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937298728270 + ... + 937298728291.

It is an arithmetic number, because the mean of its divisors is an integer number (5623792369686).

Almost surely, 2^{20620572022171} is an apocalyptic number.

20620572022171 is a deficient number, since it is larger than the sum of its proper divisors (1874597456573).

20620572022171 is a wasteful number, since it uses less digits than its factorization.

20620572022171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874597456572.

The product of its (nonzero) digits is 47040, while the sum is 37.

Adding to 20620572022171 its reverse (17122027502602), we get a palindrome (37742599524773).

The spelling of 20620572022171 in words is "twenty trillion, six hundred twenty billion, five hundred seventy-two million, twenty-two thousand, one hundred seventy-one".