20561053 has 2 divisors, whose sum is σ = 20561054. Its totient is φ = 20561052.

The previous prime is 20561033. The next prime is 20561069. The reversal of 20561053 is 35016502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20313049 + 248004 = 4507^2 + 498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20561053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20561033) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10280526 + 10280527.

It is an arithmetic number, because the mean of its divisors is an integer number (10280527).

Almost surely, 2^20561053 is an apocalyptic number.

It is an amenable number.

20561053 is a deficient number, since it is larger than the sum of its proper divisors (1).

20561053 is an equidigital number, since it uses as much as digits as its factorization.

20561053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20561053 is about 4534.4297326125. The cubic root of 20561053 is about 273.9566104238.

Adding to 20561053 its reverse (35016502), we get a palindrome (55577555).

The spelling of 20561053 in words is "twenty million, five hundred sixty-one thousand, fifty-three".