20657041 has 2 divisors, whose sum is σ = 20657042. Its totient is φ = 20657040.

The previous prime is 20657027. The next prime is 20657051. The reversal of 20657041 is 14075602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 16 = 4545^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 20657041 - 2⁹ = 20656529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20656997 and 20657015.

It is not a weakly prime, because it can be changed into another prime (20657051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328520 + 10328521.

It is an arithmetic number, because the mean of its divisors is an integer number (10328521).

Almost surely, 2^20657041 is an apocalyptic number.

It is an amenable number.

20657041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20657041 is an equidigital number, since it uses as much as digits as its factorization.

20657041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20657041 is about 4545.0017601757. The cubic root of 20657041 is about 274.3822652068.

The spelling of 20657041 in words is "twenty million, six hundred fifty-seven thousand, forty-one".