20381163 has 16 divisors (see below), whose sum is σ = 29725056. Its totient is φ = 12319040.

The previous prime is 20381159. The next prime is 20381173. The reversal of 20381163 is 36118302.

It is a cyclic number.

It is not a de Polignac number, because 20381163 - 2² = 20381159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20381173) 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, 18031 + ... + 19127.

It is an arithmetic number, because the mean of its divisors is an integer number (1857816).

Almost surely, 2^20381163 is an apocalyptic number.

20381163 is a deficient number, since it is larger than the sum of its proper divisors (9343893).

20381163 is a wasteful number, since it uses less digits than its factorization.

20381163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20381163 is about 4514.5501437020. The cubic root of 20381163 is about 273.1553142174.

Adding to 20381163 its reverse (36118302), we get a palindrome (56499465).

It can be divided in two parts, 20 and 381163, that added together give a palindrome (381183).

The spelling of 20381163 in words is "twenty million, three hundred eighty-one thousand, one hundred sixty-three".