20009611 has 2 divisors, whose sum is σ = 20009612. Its totient is φ = 20009610.

The previous prime is 20009597. The next prime is 20009651. The reversal of 20009611 is 11690002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20009611 - 2¹⁷ = 19878539 is a prime.

It is not a weakly prime, because it can be changed into another prime (20009651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004805 + 10004806.

It is an arithmetic number, because the mean of its divisors is an integer number (10004806).

Almost surely, 2^20009611 is an apocalyptic number.

20009611 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009611 is an equidigital number, since it uses as much as digits as its factorization.

20009611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20009611 is about 4473.2103684043. The cubic root of 20009611 is about 271.4852351427.

Adding to 20009611 its reverse (11690002), we get a palindrome (31699613).

It can be divided in two parts, 2000 and 9611, that added together give a palindrome (11611).

The spelling of 20009611 in words is "twenty million, nine thousand, six hundred eleven".