20330441981 has 2 divisors, whose sum is σ = 20330441982. Its totient is φ = 20330441980.

The previous prime is 20330441939. The next prime is 20330442007. The reversal of 20330441981 is 18914403302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17935905625 + 2394536356 = 133925^2 + 48934^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330441981 - 2¹⁰ = 20330440957 is a prime.

It is a super-2 number, since 2×20330441981² (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 (20330441081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165220990 + 10165220991.

It is an arithmetic number, because the mean of its divisors is an integer number (10165220991).

Almost surely, 2^20330441981 is an apocalyptic number.

It is an amenable number.

20330441981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330441981 is an equidigital number, since it uses as much as digits as its factorization.

20330441981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 20330441981 in words is "twenty billion, three hundred thirty million, four hundred forty-one thousand, nine hundred eighty-one".