2020840681 has 2 divisors, whose sum is σ = 2020840682. Its totient is φ = 2020840680.

The previous prime is 2020840649. The next prime is 2020840687. The reversal of 2020840681 is 1860480202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1054625625 + 966215056 = 32475^2 + 31084^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020840681 - 2⁵ = 2020840649 is a prime.

It is a super-2 number, since 2×2020840681² = 8167594115969087522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2020840687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010420340 + 1010420341.

It is an arithmetic number, because the mean of its divisors is an integer number (1010420341).

Almost surely, 2^2020840681 is an apocalyptic number.

It is an amenable number.

2020840681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020840681 is an equidigital number, since it uses as much as digits as its factorization.

2020840681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 2020840681 is about 44953.7615889928. The cubic root of 2020840681 is about 1264.2822053305.

The spelling of 2020840681 in words is "two billion, twenty million, eight hundred forty thousand, six hundred eighty-one".