20881105 has 12 divisors (see below), whose sum is σ = 29148660. Its totient is φ = 14318304.

The previous prime is 20881097. The next prime is 20881109. The reversal of 20881105 is 50118802.

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 10870209 = 3164^2 + 3297^2 .

It is not a de Polignac number, because 20881105 - 2³ = 20881097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20881105.

It is not an unprimeable number, because it can be changed into a prime (20881109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42370 + ... + 42859.

It is an arithmetic number, because the mean of its divisors is an integer number (2429055).

Almost surely, 2^20881105 is an apocalyptic number.

It is an amenable number.

20881105 is a deficient number, since it is larger than the sum of its proper divisors (8267555).

20881105 is an equidigital number, since it uses as much as digits as its factorization.

20881105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85248 (or 85241 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 20881105 is about 4569.5847732589. The cubic root of 20881105 is about 275.3707616136.

Adding to 20881105 its reverse (50118802), we get a palindrome (70999907).

The spelling of 20881105 in words is "twenty million, eight hundred eighty-one thousand, one hundred five".