201020209 has 8 divisors (see below), whose sum is σ = 227877440. Its totient is φ = 175790736.

The previous prime is 201020201. The next prime is 201020233. The reversal of 201020209 is 902020102.

It is a happy number.

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

It is not a de Polignac number, because 201020209 - 2³ = 201020201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201020192 and 201020201.

It is not an unprimeable number, because it can be changed into a prime (201020201) 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 7 ways as a sum of consecutive naturals, for example, 406677 + ... + 407170.

It is an arithmetic number, because the mean of its divisors is an integer number (28484680).

Almost surely, 2^201020209 is an apocalyptic number.

It is an amenable number.

201020209 is a deficient number, since it is larger than the sum of its proper divisors (26857231).

201020209 is a wasteful number, since it uses less digits than its factorization.

201020209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813879.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 201020209 is about 14178.1595773217. The cubic root of 201020209 is about 585.7962313805.

The spelling of 201020209 in words is "two hundred one million, twenty thousand, two hundred nine".