20009659 has 2 divisors, whose sum is σ = 20009660. Its totient is φ = 20009658.

The previous prime is 20009653. The next prime is 20009677. The reversal of 20009659 is 95690002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20009659 - 2³ = 20009651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20009659.

It is not a weakly prime, because it can be changed into another prime (20009651) 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, 10004829 + 10004830.

It is an arithmetic number, because the mean of its divisors is an integer number (10004830).

Almost surely, 2^20009659 is an apocalyptic number.

20009659 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009659 is an equidigital number, since it uses as much as digits as its factorization.

20009659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20009659 is about 4473.2157336753. The cubic root of 20009659 is about 271.4854522264.

The spelling of 20009659 in words is "twenty million, nine thousand, six hundred fifty-nine".