20705388167 has 2 divisors, whose sum is σ = 20705388168. Its totient is φ = 20705388166.

The previous prime is 20705388113. The next prime is 20705388169. The reversal of 20705388167 is 76188350702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20705388167 - 2²⁴ = 20688610951 is a prime.

It is a super-2 number, since 2×20705388167² (a number of 21 digits) contains 22 as substring.

Together with 20705388169, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20705388169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352694083 + 10352694084.

It is an arithmetic number, because the mean of its divisors is an integer number (10352694084).

Almost surely, 2^20705388167 is an apocalyptic number.

20705388167 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705388167 is an equidigital number, since it uses as much as digits as its factorization.

20705388167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 20705388167 in words is "twenty billion, seven hundred five million, three hundred eighty-eight thousand, one hundred sixty-seven".