20071231 has 4 divisors (see below), whose sum is σ = 20084272. Its totient is φ = 20058192.

The previous prime is 20071217. The next prime is 20071267. The reversal of 20071231 is 13217002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20071231 - 2⁵ = 20071199 is a prime.

It is a super-2 number, since 2×20071231² = 805708627710722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20071211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3846 + ... + 7411.

It is an arithmetic number, because the mean of its divisors is an integer number (5021068).

Almost surely, 2^20071231 is an apocalyptic number.

20071231 is a deficient number, since it is larger than the sum of its proper divisors (13041).

20071231 is a wasteful number, since it uses less digits than its factorization.

20071231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13040.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20071231 is about 4480.0927445757. The cubic root of 20071231 is about 271.7636309789.

Adding to 20071231 its reverse (13217002), we get a palindrome (33288233).

It can be divided in two parts, 20071 and 231, that added together give a palindrome (20302).

The spelling of 20071231 in words is "twenty million, seventy-one thousand, two hundred thirty-one".