20708163 has 16 divisors (see below), whose sum is σ = 35061760. Its totient is φ = 11833128.

The previous prime is 20708141. The next prime is 20708179. The reversal of 20708163 is 36180702.

It is not a de Polignac number, because 20708163 - 2⁶ = 20708099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20708183) 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, 54595 + ... + 54972.

It is an arithmetic number, because the mean of its divisors is an integer number (2191360).

Almost surely, 2^20708163 is an apocalyptic number.

20708163 is a deficient number, since it is larger than the sum of its proper divisors (14353597).

20708163 is a wasteful number, since it uses less digits than its factorization.

20708163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109583 (or 109577 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20708163 is about 4550.6222651413. The cubic root of 20708163 is about 274.6084256193.

Adding to 20708163 its reverse (36180702), we get a palindrome (56888865).

The spelling of 20708163 in words is "twenty million, seven hundred eight thousand, one hundred sixty-three".