20168657177 has 12 divisors (see below), whose sum is σ = 20661110640. Its totient is φ = 19687690008.

The previous prime is 20168657141. The next prime is 20168657209. The reversal of 20168657177 is 77175686102.

It is not a de Polignac number, because 20168657177 - 2²² = 20164462873 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20168657107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6024218 + ... + 6027564.

It is an arithmetic number, because the mean of its divisors is an integer number (1721759220).

Almost surely, 2^20168657177 is an apocalyptic number.

It is an amenable number.

20168657177 is a deficient number, since it is larger than the sum of its proper divisors (492453463).

20168657177 is an equidigital number, since it uses as much as digits as its factorization.

20168657177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6692 (or 6649 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 50.

The spelling of 20168657177 in words is "twenty billion, one hundred sixty-eight million, six hundred fifty-seven thousand, one hundred seventy-seven".