20660897 has 2 divisors, whose sum is σ = 20660898. Its totient is φ = 20660896.

The previous prime is 20660881. The next prime is 20660947. The reversal of 20660897 is 79806602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 4532641 = 4016^2 + 2129^2 .

It is a cyclic number.

It is not a de Polignac number, because 20660897 - 2⁴ = 20660881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20660897.

It is not a weakly prime, because it can be changed into another prime (20660197) 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, 10330448 + 10330449.

It is an arithmetic number, because the mean of its divisors is an integer number (10330449).

Almost surely, 2^20660897 is an apocalyptic number.

It is an amenable number.

20660897 is a deficient number, since it is larger than the sum of its proper divisors (1).

20660897 is an equidigital number, since it uses as much as digits as its factorization.

20660897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 20660897 is about 4545.4259426373. The cubic root of 20660897 is about 274.3993369031.

The spelling of 20660897 in words is "twenty million, six hundred sixty thousand, eight hundred ninety-seven".