20881143 has 6 divisors (see below), whose sum is σ = 30161664. Its totient is φ = 13920756.

The previous prime is 20881141. The next prime is 20881163. The reversal of 20881143 is 34118802.

It is not a de Polignac number, because 20881143 - 2¹ = 20881141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1160055 + ... + 1160072.

It is an arithmetic number, because the mean of its divisors is an integer number (5026944).

Almost surely, 2^20881143 is an apocalyptic number.

20881143 is a deficient number, since it is larger than the sum of its proper divisors (9280521).

20881143 is a wasteful number, since it uses less digits than its factorization.

20881143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320133 (or 2320130 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20881143 is about 4569.5889311841. The cubic root of 20881143 is about 275.3709286559.

Adding to 20881143 its reverse (34118802), we get a palindrome (54999945).

The spelling of 20881143 in words is "twenty million, eight hundred eighty-one thousand, one hundred forty-three".