20441831 has 2 divisors, whose sum is σ = 20441832. Its totient is φ = 20441830.

The previous prime is 20441809. The next prime is 20441833. The reversal of 20441831 is 13814402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20441831 is a prime.

It is a super-2 number, since 2×20441831² = 835736909265122, which contains 22 as substring.

Together with 20441833, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20441797 and 20441806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20441833) 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 as a sum of consecutive naturals, namely, 10220915 + 10220916.

It is an arithmetic number, because the mean of its divisors is an integer number (10220916).

Almost surely, 2^20441831 is an apocalyptic number.

20441831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20441831 is an equidigital number, since it uses as much as digits as its factorization.

20441831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20441831 is about 4521.2643143262. The cubic root of 20441831 is about 273.4260768300.

The spelling of 20441831 in words is "twenty million, four hundred forty-one thousand, eight hundred thirty-one".