20881116 has 18 divisors (see below), whose sum is σ = 52782912. Its totient is φ = 6960360.

The previous prime is 20881111. The next prime is 20881121. The reversal of 20881116 is 61118802.

It is an interprime number because it is at equal distance from previous prime (20881111) and next prime (20881121).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20881116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881111) 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, 289980 + ... + 290051.

It is an arithmetic number, because the mean of its divisors is an integer number (2932384).

Almost surely, 2^20881116 is an apocalyptic number.

It is an amenable number.

20881116 is an abundant number, since it is smaller than the sum of its proper divisors (31901796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20881116 is a wasteful number, since it uses less digits than its factorization.

20881116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580041 (or 580036 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 20881116 is about 4569.5859768692. The cubic root of 20881116 is about 275.3708099680.

Adding to 20881116 its reverse (61118802), we get a palindrome (81999918).

The spelling of 20881116 in words is "twenty million, eight hundred eighty-one thousand, one hundred sixteen".