20536231 has 2 divisors, whose sum is σ = 20536232. Its totient is φ = 20536230.

The previous prime is 20536213. The next prime is 20536279. The reversal of 20536231 is 13263502.

Together with previous prime (20536213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20536231 - 2⁹ = 20535719 is a prime.

It is a super-2 number, since 2×20536231² = 843473567370722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20536331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10268115 + 10268116.

It is an arithmetic number, because the mean of its divisors is an integer number (10268116).

Almost surely, 2^20536231 is an apocalyptic number.

20536231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20536231 is an equidigital number, since it uses as much as digits as its factorization.

20536231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20536231 is about 4531.6918474230. The cubic root of 20536231 is about 273.8463227961.

Adding to 20536231 its reverse (13263502), we get a palindrome (33799733).

The spelling of 20536231 in words is "twenty million, five hundred thirty-six thousand, two hundred thirty-one".