20353685017 has 4 divisors (see below), whose sum is σ = 20358791460. Its totient is φ = 20348578576.

The previous prime is 20353684997. The next prime is 20353685117. The reversal of 20353685017 is 71058635302.

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 5160410896 + 15193274121 = 71836^2 + 123261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20353685017 - 2¹¹ = 20353682969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20353685117) 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, 2547238 + ... + 2555215.

It is an arithmetic number, because the mean of its divisors is an integer number (5089697865).

Almost surely, 2^20353685017 is an apocalyptic number.

It is an amenable number.

20353685017 is a deficient number, since it is larger than the sum of its proper divisors (5106443).

20353685017 is an equidigital number, since it uses as much as digits as its factorization.

20353685017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106442.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 20353685017 in words is "twenty billion, three hundred fifty-three million, six hundred eighty-five thousand, seventeen".