20311106166 has 48 divisors (see below), whose sum is σ = 47403248256. Its totient is φ = 6248164608.

The previous prime is 20311106149. The next prime is 20311106173. The reversal of 20311106166 is 66160111302.

20311106166 is a `hidden beast` number, since 2 + 0 + 31 + 1 + 10 + 616 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1592571 + ... + 1605273.

It is an arithmetic number, because the mean of its divisors is an integer number (987567672).

Almost surely, 2^20311106166 is an apocalyptic number.

20311106166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20311106166 is an abundant number, since it is smaller than the sum of its proper divisors (27092142090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20311106166 is a wasteful number, since it uses less digits than its factorization.

20311106166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19557 (or 19554 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

Adding to 20311106166 its reverse (66160111302), we get a palindrome (86471217468).

The spelling of 20311106166 in words is "twenty billion, three hundred eleven million, one hundred six thousand, one hundred sixty-six".