20165231 has 2 divisors, whose sum is σ = 20165232. Its totient is φ = 20165230.

The previous prime is 20165203. The next prime is 20165239. The reversal of 20165231 is 13256102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20165231 - 2¹⁴ = 20148847 is a prime.

It is a super-2 number, since 2×20165231² = 813273082566722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20165239) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082615 + 10082616.

It is an arithmetic number, because the mean of its divisors is an integer number (10082616).

Almost surely, 2^20165231 is an apocalyptic number.

20165231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165231 is an equidigital number, since it uses as much as digits as its factorization.

20165231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20165231 is about 4490.5713444950. The cubic root of 20165231 is about 272.1872224211.

The spelling of 20165231 in words is "twenty million, one hundred sixty-five thousand, two hundred thirty-one".