20727117173 has 16 divisors (see below), whose sum is σ = 24727034880. Its totient is φ = 16999804800.

The previous prime is 20727117167. The next prime is 20727117197. The reversal of 20727117173 is 37171172702.

It is not a de Polignac number, because 20727117173 - 2²⁶ = 20660008309 is a prime.

It is a super-2 number, since 2×20727117173² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20727117113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517298 + ... + 555923.

It is an arithmetic number, because the mean of its divisors is an integer number (1545439680).

Almost surely, 2^20727117173 is an apocalyptic number.

It is an amenable number.

20727117173 is a deficient number, since it is larger than the sum of its proper divisors (3999917707).

20727117173 is a wasteful number, since it uses less digits than its factorization.

20727117173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073348.

The product of its (nonzero) digits is 28812, while the sum is 38.

Adding to 20727117173 its reverse (37171172702), we get a palindrome (57898289875).

The spelling of 20727117173 in words is "twenty billion, seven hundred twenty-seven million, one hundred seventeen thousand, one hundred seventy-three".