2020861 has 2 divisors, whose sum is σ = 2020862. Its totient is φ = 2020860.

The previous prime is 2020853. The next prime is 2020877. The reversal of 2020861 is 1680202.

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., 1988100 + 32761 = 1410^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020861 - 2³ = 2020853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010430 + 1010431.

It is an arithmetic number, because the mean of its divisors is an integer number (1010431).

2^2020861 is an apocalyptic number.

It is an amenable number.

2020861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020861 is an equidigital number, since it uses as much as digits as its factorization.

2020861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2020861 is about 1421.5699068284. The cubic root of 2020861 is about 126.4286442654.

The spelling of 2020861 in words is "two million, twenty thousand, eight hundred sixty-one".