20441231231 has 4 divisors (see below), whose sum is σ = 20442367200. Its totient is φ = 20440095264.

The previous prime is 20441231207. The next prime is 20441231243. The reversal of 20441231231 is 13213214402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20441231231 is a prime.

It is a super-3 number, since 3×20441231231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20441231197 and 20441231206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20441231281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540551 + ... + 577128.

It is an arithmetic number, because the mean of its divisors is an integer number (5110591800).

Almost surely, 2^20441231231 is an apocalyptic number.

20441231231 is a deficient number, since it is larger than the sum of its proper divisors (1135969).

20441231231 is a wasteful number, since it uses less digits than its factorization.

20441231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135968.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20441231231 its reverse (13213214402), we get a palindrome (33654445633).

The spelling of 20441231231 in words is "twenty billion, four hundred forty-one million, two hundred thirty-one thousand, two hundred thirty-one".