20441263781 has 2 divisors, whose sum is σ = 20441263782. Its totient is φ = 20441263780.

The previous prime is 20441263741. The next prime is 20441263783. The reversal of 20441263781 is 18736214402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18827956225 + 1613307556 = 137215^2 + 40166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20441263781 is a prime.

It is a super-2 number, since 2×20441263781² (a number of 21 digits) contains 22 as substring.

Together with 20441263783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20441263783) 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, 10220631890 + 10220631891.

It is an arithmetic number, because the mean of its divisors is an integer number (10220631891).

Almost surely, 2^20441263781 is an apocalyptic number.

It is an amenable number.

20441263781 is a deficient number, since it is larger than the sum of its proper divisors (1).

20441263781 is an equidigital number, since it uses as much as digits as its factorization.

20441263781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 20441263781 in words is "twenty billion, four hundred forty-one million, two hundred sixty-three thousand, seven hundred eighty-one".