20353530209 has 4 divisors (see below), whose sum is σ = 20380276740. Its totient is φ = 20326783680.

The previous prime is 20353530199. The next prime is 20353530229. The reversal of 20353530209 is 90203535302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5778280225 + 14575249984 = 76015^2 + 120728^2 .

It is a cyclic number.

It is not a de Polignac number, because 20353530209 - 2⁴ = 20353530193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20353530229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13372124 + ... + 13373645.

It is an arithmetic number, because the mean of its divisors is an integer number (5095069185).

Almost surely, 2^20353530209 is an apocalyptic number.

It is an amenable number.

20353530209 is a deficient number, since it is larger than the sum of its proper divisors (26746531).

20353530209 is an equidigital number, since it uses as much as digits as its factorization.

20353530209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26746530.

The product of its (nonzero) digits is 24300, while the sum is 32.

The spelling of 20353530209 in words is "twenty billion, three hundred fifty-three million, five hundred thirty thousand, two hundred nine".