20127231 has 16 divisors (see below), whose sum is σ = 31115520. Its totient is φ = 12834360.

The previous prime is 20127203. The next prime is 20127253. The reversal of 20127231 is 13272102.

It is not a de Polignac number, because 20127231 - 2¹⁰ = 20126207 is a prime.

It is a super-2 number, since 2×20127231² = 810210855454722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20127431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15585 + ... + 16826.

It is an arithmetic number, because the mean of its divisors is an integer number (1944720).

Almost surely, 2^20127231 is an apocalyptic number.

20127231 is a deficient number, since it is larger than the sum of its proper divisors (10988289).

20127231 is a wasteful number, since it uses less digits than its factorization.

20127231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32443 (or 32437 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20127231 is about 4486.3382618791. The cubic root of 20127231 is about 272.0161421721.

Adding to 20127231 its reverse (13272102), we get a palindrome (33399333).

The spelling of 20127231 in words is "twenty million, one hundred twenty-seven thousand, two hundred thirty-one".