209020011 has 16 divisors (see below), whose sum is σ = 288979968. Its totient is φ = 134244000.

The previous prime is 209019983. The next prime is 209020013. The reversal of 209020011 is 110020902.

It is a happy number.

It is not a de Polignac number, because 209020011 - 2¹³ = 209011819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209020013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16161 + ... + 26061.

It is an arithmetic number, because the mean of its divisors is an integer number (18061248).

Almost surely, 2^209020011 is an apocalyptic number.

209020011 is a deficient number, since it is larger than the sum of its proper divisors (79959957).

209020011 is a wasteful number, since it uses less digits than its factorization.

209020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10162.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 209020011 is about 14457.5243731422. The cubic root of 209020011 is about 593.4661535826.

Adding to 209020011 its reverse (110020902), we get a palindrome (319040913).

The spelling of 209020011 in words is "two hundred nine million, twenty thousand, eleven".