20017009 has 2 divisors, whose sum is σ = 20017010. Its totient is φ = 20017008.

The previous prime is 20017001. The next prime is 20017031. The reversal of 20017009 is 90071002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 18225 = 4472^2 + 135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20017009 - 2³ = 20017001 is a prime.

It is not a weakly prime, because it can be changed into another prime (20017001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008504 + 10008505.

It is an arithmetic number, because the mean of its divisors is an integer number (10008505).

Almost surely, 2^20017009 is an apocalyptic number.

It is an amenable number.

20017009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20017009 is an equidigital number, since it uses as much as digits as its factorization.

20017009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 20017009 is about 4474.0372148653. The cubic root of 20017009 is about 271.5186890714.

The spelling of 20017009 in words is "twenty million, seventeen thousand, nine".