20564041 has 2 divisors, whose sum is σ = 20564042. Its totient is φ = 20564040.

The previous prime is 20564039. The next prime is 20564059. The reversal of 20564041 is 14046502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 1901641 = 4320^2 + 1379^2 .

It is a cyclic number.

It is not a de Polignac number, because 20564041 - 2¹ = 20564039 is a prime.

Together with 20564039, 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 (20564021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10282020 + 10282021.

It is an arithmetic number, because the mean of its divisors is an integer number (10282021).

Almost surely, 2^20564041 is an apocalyptic number.

It is an amenable number.

20564041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20564041 is an equidigital number, since it uses as much as digits as its factorization.

20564041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20564041 is about 4534.7591997812. The cubic root of 20564041 is about 273.9698805403.

It can be divided in two parts, 205 and 64041, that added together give a palindrome (64246).

The spelling of 20564041 in words is "twenty million, five hundred sixty-four thousand, forty-one".