20441231 has 4 divisors (see below), whose sum is σ = 20746392. Its totient is φ = 20136072.

The previous prime is 20441203. The next prime is 20441233. The reversal of 20441231 is 13214402.

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 20441231 - 2⁶ = 20441167 is a prime.

It is a super-2 number, since 2×20441231² = 835687849590722, 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 (20441233) 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, 152480 + ... + 152613.

It is an arithmetic number, because the mean of its divisors is an integer number (5186598).

Almost surely, 2^20441231 is an apocalyptic number.

20441231 is a deficient number, since it is larger than the sum of its proper divisors (305161).

20441231 is an equidigital number, since it uses as much as digits as its factorization.

20441231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305160.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20441231 is about 4521.1979607179. The cubic root of 20441231 is about 273.4234016415.

Adding to 20441231 its reverse (13214402), we get a palindrome (33655633).

The spelling of 20441231 in words is "twenty million, four hundred forty-one thousand, two hundred thirty-one".