20816163 has 32 divisors (see below), whose sum is σ = 32248320. Its totient is φ = 13258080.

The previous prime is 20816161. The next prime is 20816167. The reversal of 20816163 is 36161802.

It is not a de Polignac number, because 20816163 - 2¹ = 20816161 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20816161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66778 + ... + 67088.

It is an arithmetic number, because the mean of its divisors is an integer number (1007760).

Almost surely, 2^20816163 is an apocalyptic number.

20816163 is a deficient number, since it is larger than the sum of its proper divisors (11432157).

20816163 is a wasteful number, since it uses less digits than its factorization.

20816163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20816163 is about 4562.4733423879. The cubic root of 20816163 is about 275.0849897089.

Adding to 20816163 its reverse (36161802), we get a palindrome (56977965).

The spelling of 20816163 in words is "twenty million, eight hundred sixteen thousand, one hundred sixty-three".