20320105 has 8 divisors (see below), whose sum is σ = 26259912. Its totient is φ = 15005568.

The previous prime is 20320103. The next prime is 20320171. The reversal of 20320105 is 50102302.

It can be written as a sum of positive squares in 4 ways, for example, as 3279721 + 17040384 = 1811^2 + 4128^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20320105 - 2¹ = 20320103 is a prime.

It is a super-2 number, since 2×20320105² = 825813334422050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156244 + ... + 156373.

It is an arithmetic number, because the mean of its divisors is an integer number (3282489).

Almost surely, 2^20320105 is an apocalyptic number.

It is an amenable number.

20320105 is a deficient number, since it is larger than the sum of its proper divisors (5939807).

20320105 is a wasteful number, since it uses less digits than its factorization.

20320105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312635.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 20320105 is about 4507.7827143730. The cubic root of 20320105 is about 272.8822679745.

Adding to 20320105 its reverse (50102302), we get a palindrome (70422407).

The spelling of 20320105 in words is "twenty million, three hundred twenty thousand, one hundred five".