2020520561 has 2 divisors, whose sum is σ = 2020520562. Its totient is φ = 2020520560.

The previous prime is 2020520539. The next prime is 2020520563. The reversal of 2020520561 is 1650250202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1869697600 + 150822961 = 43240^2 + 12281^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020520561 - 2⁶ = 2020520497 is a prime.

Together with 2020520563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2020520563) 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, 1010260280 + 1010260281.

It is an arithmetic number, because the mean of its divisors is an integer number (1010260281).

Almost surely, 2^2020520561 is an apocalyptic number.

It is an amenable number.

2020520561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020520561 is an equidigital number, since it uses as much as digits as its factorization.

2020520561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2020520561 is about 44950.2009005522. The cubic root of 2020520561 is about 1264.2154437766.

Adding to 2020520561 its reverse (1650250202), we get a palindrome (3670770763).

The spelling of 2020520561 in words is "two billion, twenty million, five hundred twenty thousand, five hundred sixty-one".