20409112 has 16 divisors (see below), whose sum is σ = 40518360. Its totient is φ = 9604224.

The previous prime is 20409107. The next prime is 20409113. The reversal of 20409112 is 21190402.

It is a self number, because there is not a number n which added to its sum of digits gives 20409112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20409113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74898 + ... + 75169.

Almost surely, 2^20409112 is an apocalyptic number.

It is an amenable number.

20409112 is a deficient number, since it is larger than the sum of its proper divisors (20109248).

20409112 is a wasteful number, since it uses less digits than its factorization.

20409112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150090 (or 150086 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20409112 is about 4517.6445189944. The cubic root of 20409112 is about 273.2801178707.

Adding to 20409112 its reverse (21190402), we get a palindrome (41599514).

The spelling of 20409112 in words is "twenty million, four hundred nine thousand, one hundred twelve".