20012609 has 2 divisors, whose sum is σ = 20012610. Its totient is φ = 20012608.

The previous prime is 20012593. The next prime is 20012683. The reversal of 20012609 is 90621002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 4528384 = 3935^2 + 2128^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012609 - 2⁴ = 20012593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20011609) 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, 10006304 + 10006305.

It is an arithmetic number, because the mean of its divisors is an integer number (10006305).

Almost surely, 2^20012609 is an apocalyptic number.

It is an amenable number.

20012609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012609 is an equidigital number, since it uses as much as digits as its factorization.

20012609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20012609 is about 4473.5454619351. The cubic root of 20012609 is about 271.4987931622.

The spelling of 20012609 in words is "twenty million, twelve thousand, six hundred nine".