20568461 has 2 divisors, whose sum is σ = 20568462. Its totient is φ = 20568460.

The previous prime is 20568451. The next prime is 20568497. The reversal of 20568461 is 16486502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 1155625 = 4406^2 + 1075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20568461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20568421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10284230 + 10284231.

It is an arithmetic number, because the mean of its divisors is an integer number (10284231).

Almost surely, 2^20568461 is an apocalyptic number.

It is an amenable number.

20568461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20568461 is an equidigital number, since it uses as much as digits as its factorization.

20568461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20568461 is about 4535.2465203118. The cubic root of 20568461 is about 273.9895080075.

The spelling of 20568461 in words is "twenty million, five hundred sixty-eight thousand, four hundred sixty-one".