20320165105 has 8 divisors (see below), whose sum is σ = 24384964032. Its totient is φ = 16255621488.

The previous prime is 20320165081. The next prime is 20320165153. The reversal of 20320165105 is 50156102302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20320165105 is a prime.

It is a super-2 number, since 2×20320165105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20320165105.

It is an unprimeable number.

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, 270174 + ... + 337096.

It is an arithmetic number, because the mean of its divisors is an integer number (3048120504).

Almost surely, 2^20320165105 is an apocalyptic number.

It is an amenable number.

20320165105 is a deficient number, since it is larger than the sum of its proper divisors (4064798927).

20320165105 is an equidigital number, since it uses as much as digits as its factorization.

20320165105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127655.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20320165105 its reverse (50156102302), we get a palindrome (70476267407).

The spelling of 20320165105 in words is "twenty billion, three hundred twenty million, one hundred sixty-five thousand, one hundred five".