20409163 has 16 divisors (see below), whose sum is σ = 22555584. Its totient is φ = 18385920.

The previous prime is 20409157. The next prime is 20409199. The reversal of 20409163 is 36190402.

It is a cyclic number.

It is not a de Polignac number, because 20409163 - 2⁵ = 20409131 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44431 + ... + 44887.

It is an arithmetic number, because the mean of its divisors is an integer number (1409724).

Almost surely, 2^20409163 is an apocalyptic number.

20409163 is a deficient number, since it is larger than the sum of its proper divisors (2146421).

20409163 is a wasteful number, since it uses less digits than its factorization.

20409163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20409163 is about 4517.6501635253. The cubic root of 20409163 is about 273.2803455022.

Adding to 20409163 its reverse (36190402), we get a palindrome (56599565).

The spelling of 20409163 in words is "twenty million, four hundred nine thousand, one hundred sixty-three".