20704165 has 8 divisors (see below), whose sum is σ = 25101720. Its totient is φ = 16392192.

The previous prime is 20704141. The next prime is 20704171. The reversal of 20704165 is 56140702.

It can be written as a sum of positive squares in 4 ways, for example, as 1052676 + 19651489 = 1026^2 + 4433^2 .

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 20704165 - 2⁷ = 20704037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20860 + ... + 21829.

It is an arithmetic number, because the mean of its divisors is an integer number (3137715).

Almost surely, 2^20704165 is an apocalyptic number.

It is an amenable number.

20704165 is a deficient number, since it is larger than the sum of its proper divisors (4397555).

20704165 is an equidigital number, since it uses as much as digits as its factorization.

20704165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42791.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20704165 is about 4550.1829633543. The cubic root of 20704165 is about 274.5907521517.

Adding to 20704165 its reverse (56140702), we get a palindrome (76844867).

The spelling of 20704165 in words is "twenty million, seven hundred four thousand, one hundred sixty-five".