20431971177 has 8 divisors (see below), whose sum is σ = 27822258816. Its totient is φ = 13331498832.

The previous prime is 20431971173. The next prime is 20431971187. The reversal of 20431971177 is 77117913402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20431971177 - 2² = 20431971173 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20431971173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72453658 + ... + 72453939.

It is an arithmetic number, because the mean of its divisors is an integer number (3477782352).

Almost surely, 2^20431971177 is an apocalyptic number.

It is an amenable number.

20431971177 is a deficient number, since it is larger than the sum of its proper divisors (7390287639).

20431971177 is a wasteful number, since it uses less digits than its factorization.

20431971177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144907647.

The product of its (nonzero) digits is 74088, while the sum is 42.

The spelling of 20431971177 in words is "twenty billion, four hundred thirty-one million, nine hundred seventy-one thousand, one hundred seventy-seven".