20215165 has 8 divisors (see below), whose sum is σ = 24292440. Its totient is φ = 16149312.

The previous prime is 20215147. The next prime is 20215171. The reversal of 20215165 is 56151202.

It can be written as a sum of positive squares in 4 ways, for example, as 1179396 + 19035769 = 1086^2 + 4363^2 .

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 20215165 - 2⁵ = 20215133 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, 1707 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (3036555).

Almost surely, 2^20215165 is an apocalyptic number.

It is an amenable number.

20215165 is a deficient number, since it is larger than the sum of its proper divisors (4077275).

20215165 is an equidigital number, since it uses as much as digits as its factorization.

20215165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5711.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 20215165 is about 4496.1277784333. The cubic root of 20215165 is about 272.4117044126.

Adding to 20215165 its reverse (56151202), we get a palindrome (76366367).

The spelling of 20215165 in words is "twenty million, two hundred fifteen thousand, one hundred sixty-five".