20466080981 has 2 divisors, whose sum is σ = 20466080982. Its totient is φ = 20466080980.

The previous prime is 20466080927. The next prime is 20466081019. The reversal of 20466080981 is 18908066402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13926124081 + 6539956900 = 118009^2 + 80870^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466080981 - 2¹⁸ = 20465818837 is a prime.

It is a super-2 number, since 2×20466080981² (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 (20466080381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10233040490 + 10233040491.

It is an arithmetic number, because the mean of its divisors is an integer number (10233040491).

Almost surely, 2^20466080981 is an apocalyptic number.

It is an amenable number.

20466080981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466080981 is an equidigital number, since it uses as much as digits as its factorization.

20466080981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 20466080981 in words is "twenty billion, four hundred sixty-six million, eighty thousand, nine hundred eighty-one".