20209111 has 8 divisors (see below), whose sum is σ = 22710240. Its totient is φ = 17843232.

The previous prime is 20209109. The next prime is 20209121. The reversal of 20209111 is 11190202.

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 20209111 - 2¹ = 20209109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20209121) 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, 33496 + ... + 34093.

It is an arithmetic number, because the mean of its divisors is an integer number (2838780).

Almost surely, 2^20209111 is an apocalyptic number.

20209111 is a deficient number, since it is larger than the sum of its proper divisors (2501129).

20209111 is a wasteful number, since it uses less digits than its factorization.

20209111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67625.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 20209111 is about 4495.4544820296. The cubic root of 20209111 is about 272.3845079141.

Adding to 20209111 its reverse (11190202), we get a palindrome (31399313).

The spelling of 20209111 in words is "twenty million, two hundred nine thousand, one hundred eleven".