20817059 has 2 divisors, whose sum is σ = 20817060. Its totient is φ = 20817058.

The previous prime is 20817037. The next prime is 20817077. The reversal of 20817059 is 95071802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20817059 - 2²⁴ = 4039843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20817259) 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, 10408529 + 10408530.

It is an arithmetic number, because the mean of its divisors is an integer number (10408530).

Almost surely, 2^20817059 is an apocalyptic number.

20817059 is a deficient number, since it is larger than the sum of its proper divisors (1).

20817059 is an equidigital number, since it uses as much as digits as its factorization.

20817059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20817059 is about 4562.5715336858. The cubic root of 20817059 is about 275.0889365236.

The spelling of 20817059 in words is "twenty million, eight hundred seventeen thousand, fifty-nine".