20104288209 has 20 divisors (see below), whose sum is σ = 30038888880. Its totient is φ = 13399932600.

The previous prime is 20104288207. The next prime is 20104288223. The reversal of 20104288209 is 90288240102.

20104288209 is a `hidden beast` number, since 20 + 1 + 0 + 428 + 8 + 209 = 666.

It is not a de Polignac number, because 20104288209 - 2¹ = 20104288207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20104288207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 384562 + ... + 433700.

It is an arithmetic number, because the mean of its divisors is an integer number (1501944444).

Almost surely, 2^20104288209 is an apocalyptic number.

It is an amenable number.

20104288209 is a deficient number, since it is larger than the sum of its proper divisors (9934600671).

20104288209 is an equidigital number, since it uses as much as digits as its factorization.

20104288209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54202 (or 54193 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 20104288209 in words is "twenty billion, one hundred four million, two hundred eighty-eight thousand, two hundred nine".