20200120203209 has 8 divisors (see below), whose sum is σ = 20301671294760. Its totient is φ = 20098819547136.

The previous prime is 20200120203167. The next prime is 20200120203227. The reversal of 20200120203209 is 90230202100202.

It can be written as a sum of positive squares in 4 ways, for example, as 12285620857225 + 7914499345984 = 3505085^2 + 2813272^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20200120203209 - 2⁸ = 20200120202953 is a prime.

It is a super-2 number, since 2×20200120203209² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20200120203259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62447144 + ... + 62769785.

It is an arithmetic number, because the mean of its divisors is an integer number (2537708911845).

Almost surely, 2^{20200120203209} is an apocalyptic number.

It is an amenable number.

20200120203209 is a deficient number, since it is larger than the sum of its proper divisors (101551091551).

20200120203209 is a wasteful number, since it uses less digits than its factorization.

20200120203209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125217739.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 20200120203209 in words is "twenty trillion, two hundred billion, one hundred twenty million, two hundred three thousand, two hundred nine".