20508163 has 16 divisors (see below), whose sum is σ = 23564800. Its totient is φ = 17690400.

The previous prime is 20508113. The next prime is 20508167. The reversal of 20508163 is 36180502.

It is a happy number.

It is not a de Polignac number, because 20508163 - 2¹³ = 20499971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20508167) 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, 18988 + ... + 20038.

It is an arithmetic number, because the mean of its divisors is an integer number (1472800).

Almost surely, 2^20508163 is an apocalyptic number.

20508163 is a deficient number, since it is larger than the sum of its proper divisors (3056637).

20508163 is a wasteful number, since it uses less digits than its factorization.

20508163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20508163 is about 4528.5939318954. The cubic root of 20508163 is about 273.7215056210.

Adding to 20508163 its reverse (36180502), we get a palindrome (56688665).

The spelling of 20508163 in words is "twenty million, five hundred eight thousand, one hundred sixty-three".