20408043171 has 4 divisors (see below), whose sum is σ = 27210724232. Its totient is φ = 13605362112.

The previous prime is 20408043169. The next prime is 20408043181. The reversal of 20408043171 is 17134080402.

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

It is not a de Polignac number, because 20408043171 - 2¹ = 20408043169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20408043151) 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, 3401340526 + ... + 3401340531.

It is an arithmetic number, because the mean of its divisors is an integer number (6802681058).

Almost surely, 2^20408043171 is an apocalyptic number.

20408043171 is a deficient number, since it is larger than the sum of its proper divisors (6802681061).

20408043171 is an equidigital number, since it uses as much as digits as its factorization.

20408043171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6802681060.

The product of its (nonzero) digits is 5376, while the sum is 30.

The spelling of 20408043171 in words is "twenty billion, four hundred eight million, forty-three thousand, one hundred seventy-one".