20143231 has 2 divisors, whose sum is σ = 20143232. Its totient is φ = 20143230.

The previous prime is 20143223. The next prime is 20143241. The reversal of 20143231 is 13234102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20143231 - 2³ = 20143223 is a prime.

It is a super-3 number, since 3×20143231³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20143241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071615 + 10071616.

It is an arithmetic number, because the mean of its divisors is an integer number (10071616).

Almost surely, 2^20143231 is an apocalyptic number.

20143231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143231 is an equidigital number, since it uses as much as digits as its factorization.

20143231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20143231 is about 4488.1210990792. The cubic root of 20143231 is about 272.0882021840.

Adding to 20143231 its reverse (13234102), we get a palindrome (33377333).

The spelling of 20143231 in words is "twenty million, one hundred forty-three thousand, two hundred thirty-one".