2020561 has 2 divisors, whose sum is σ = 2020562. Its totient is φ = 2020560.

The previous prime is 2020547. The next prime is 2020591. The reversal of 2020561 is 1650202.

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., 1081600 + 938961 = 1040^2 + 969^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020561 - 2¹⁹ = 1496273 is a prime.

2020561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2020511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010280 + 1010281.

It is an arithmetic number, because the mean of its divisors is an integer number (1010281).

2^2020561 is an apocalyptic number.

It is an amenable number.

2020561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020561 is an equidigital number, since it uses as much as digits as its factorization.

2020561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2020561 is about 1421.4643857656. The cubic root of 2020561 is about 126.4223877786.

Adding to 2020561 its reverse (1650202), we get a palindrome (3670763).

The spelling of 2020561 in words is "two million, twenty thousand, five hundred sixty-one".