20380396081 has 2 divisors, whose sum is σ = 20380396082. Its totient is φ = 20380396080.

The previous prime is 20380396067. The next prime is 20380396121. The reversal of 20380396081 is 18069308302.

It is an a-pointer prime, because the next prime (20380396121) can be obtained adding 20380396081 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19483693056 + 896703025 = 139584^2 + 29945^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380396081 - 2²⁷ = 20246178353 is a prime.

It is a super-2 number, since 2×20380396081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20380396021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190198040 + 10190198041.

It is an arithmetic number, because the mean of its divisors is an integer number (10190198041).

Almost surely, 2^20380396081 is an apocalyptic number.

It is an amenable number.

20380396081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20380396081 is an equidigital number, since it uses as much as digits as its factorization.

20380396081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 20380396081 in words is "twenty billion, three hundred eighty million, three hundred ninety-six thousand, eighty-one".