2000020081 has 2 divisors, whose sum is σ = 2000020082. Its totient is φ = 2000020080.

The previous prime is 2000020073. The next prime is 2000020103. The reversal of 2000020081 is 1800200002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1626912225 + 373107856 = 40335^2 + 19316^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000020081 - 2³ = 2000020073 is a prime.

It is a super-2 number, since 2×2000020081² = 8000160648806493122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2000029081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000010040 + 1000010041.

It is an arithmetic number, because the mean of its divisors is an integer number (1000010041).

Almost surely, 2^2000020081 is an apocalyptic number.

It is an amenable number.

2000020081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000020081 is an equidigital number, since it uses as much as digits as its factorization.

2000020081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2000020081 is about 44721.5840618375. The cubic root of 2000020081 is about 1259.9252666265.

Adding to 2000020081 its reverse (1800200002), we get a palindrome (3800220083).

The spelling of 2000020081 in words is "two billion, twenty thousand, eighty-one".