20409168 has 40 divisors (see below), whose sum is σ = 56781088. Its totient is φ = 6279552.

The previous prime is 20409157. The next prime is 20409199. The reversal of 20409168 is 86190402.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15730 + ... + 16977.

Almost surely, 2^20409168 is an apocalyptic number.

It is an amenable number.

20409168 is an abundant number, since it is smaller than the sum of its proper divisors (36371920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20409168 is a wasteful number, since it uses less digits than its factorization.

20409168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32731 (or 32725 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20409168 is about 4517.6507169103. The cubic root of 20409168 is about 273.2803678190.

The spelling of 20409168 in words is "twenty million, four hundred nine thousand, one hundred sixty-eight".