20709318168 has 128 divisors (see below), whose sum is σ = 71720640000. Its totient is φ = 5379039360.

The previous prime is 20709318163. The next prime is 20709318173. The reversal of 20709318168 is 86181390702.

It is an interprime number because it is at equal distance from previous prime (20709318163) and next prime (20709318173).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709318163) 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 31 ways as a sum of consecutive naturals, for example, 605943 + ... + 639206.

It is an arithmetic number, because the mean of its divisors is an integer number (560317500).

Almost surely, 2^20709318168 is an apocalyptic number.

20709318168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20709318168 is an abundant number, since it is smaller than the sum of its proper divisors (51011321832).

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

20709318168 is a wasteful number, since it uses less digits than its factorization.

20709318168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245182 (or 1245172 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 20709318168 in words is "twenty billion, seven hundred nine million, three hundred eighteen thousand, one hundred sixty-eight".