20092009 has 24 divisors (see below), whose sum is σ = 24447528. Its totient is φ = 16450560.

The previous prime is 20092001. The next prime is 20092019. The reversal of 20092009 is 90029002.

It can be written as a sum of positive squares in 4 ways, for example, as 705600 + 19386409 = 840^2 + 4403^2 .

It is not a de Polignac number, because 20092009 - 2³ = 20092001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20092001) 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 in 23 ways as a sum of consecutive naturals, for example, 146589 + ... + 146725.

It is an arithmetic number, because the mean of its divisors is an integer number (1018647).

Almost surely, 2^20092009 is an apocalyptic number.

It is an amenable number.

20092009 is a deficient number, since it is larger than the sum of its proper divisors (4355519).

20092009 is a wasteful number, since it uses less digits than its factorization.

20092009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 20092009 is about 4482.4110699489. The cubic root of 20092009 is about 271.8573763888.

Adding to 20092009 its reverse (90029002), we get a palindrome (110121011).

The spelling of 20092009 in words is "twenty million, ninety-two thousand, nine".