20706618166 has 16 divisors (see below), whose sum is σ = 33756030000. Its totient is φ = 9469221408.

The previous prime is 20706618157. The next prime is 20706618167. The reversal of 20706618166 is 66181660702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706618167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3650416 + ... + 3656083.

It is an arithmetic number, because the mean of its divisors is an integer number (2109751875).

Almost surely, 2^20706618166 is an apocalyptic number.

20706618166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20706618166 is a deficient number, since it is larger than the sum of its proper divisors (13049411834).

20706618166 is a wasteful number, since it uses less digits than its factorization.

20706618166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7306623.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 20706618166 in words is "twenty billion, seven hundred six million, six hundred eighteen thousand, one hundred sixty-six".