20108409 has 8 divisors (see below), whose sum is σ = 27465312. Its totient is φ = 13078560.

The previous prime is 20108377. The next prime is 20108411. The reversal of 20108409 is 90480102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20108409 - 2⁵ = 20108377 is a prime.

It is a super-2 number, since 2×20108409² = 808696225022562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20108419) 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 7 ways as a sum of consecutive naturals, for example, 81619 + ... + 81864.

It is an arithmetic number, because the mean of its divisors is an integer number (3433164).

Almost surely, 2^20108409 is an apocalyptic number.

It is an amenable number.

20108409 is a deficient number, since it is larger than the sum of its proper divisors (7356903).

20108409 is a wasteful number, since it uses less digits than its factorization.

20108409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163527.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20108409 is about 4484.2400693986. The cubic root of 20108409 is about 271.9313236723.

The spelling of 20108409 in words is "twenty million, one hundred eight thousand, four hundred nine".