20441332181 has 2 divisors, whose sum is σ = 20441332182. Its totient is φ = 20441332180.

The previous prime is 20441332147. The next prime is 20441332187. The reversal of 20441332181 is 18123314402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18134931556 + 2306400625 = 134666^2 + 48025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20441332181 is a prime.

It is a super-2 number, since 2×20441332181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20441332187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220666090 + 10220666091.

It is an arithmetic number, because the mean of its divisors is an integer number (10220666091).

Almost surely, 2^20441332181 is an apocalyptic number.

It is an amenable number.

20441332181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20441332181 is an equidigital number, since it uses as much as digits as its factorization.

20441332181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 20441332181 its reverse (18123314402), we get a palindrome (38564646583).

The spelling of 20441332181 in words is "twenty billion, four hundred forty-one million, three hundred thirty-two thousand, one hundred eighty-one".