20673380081 has 2 divisors, whose sum is σ = 20673380082. Its totient is φ = 20673380080.

The previous prime is 20673380071. The next prime is 20673380113. The reversal of 20673380081 is 18008337602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20109792481 + 563587600 = 141809^2 + 23740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20673380081 is a prime.

It is a super-2 number, since 2×20673380081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20673380071) 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, 10336690040 + 10336690041.

It is an arithmetic number, because the mean of its divisors is an integer number (10336690041).

Almost surely, 2^20673380081 is an apocalyptic number.

It is an amenable number.

20673380081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673380081 is an equidigital number, since it uses as much as digits as its factorization.

20673380081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 20673380081 in words is "twenty billion, six hundred seventy-three million, three hundred eighty thousand, eighty-one".