20170165 has 8 divisors (see below), whose sum is σ = 24234840. Its totient is φ = 16115712.

The previous prime is 20170141. The next prime is 20170169. The reversal of 20170165 is 56107102.

It can be written as a sum of positive squares in 4 ways, for example, as 6671889 + 13498276 = 2583^2 + 3674^2 .

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 20170165 - 2¹¹ = 20168117 is a prime.

It is a super-2 number, since 2×20170165² = 813671112254450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20170169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2821 + ... + 6949.

It is an arithmetic number, because the mean of its divisors is an integer number (3029355).

Almost surely, 2^20170165 is an apocalyptic number.

It is an amenable number.

20170165 is a deficient number, since it is larger than the sum of its proper divisors (4064675).

20170165 is an equidigital number, since it uses as much as digits as its factorization.

20170165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20170165 is about 4491.1206841945. The cubic root of 20170165 is about 272.2094200714.

Adding to 20170165 its reverse (56107102), we get a palindrome (76277267).

The spelling of 20170165 in words is "twenty million, one hundred seventy thousand, one hundred sixty-five".