20116881 has 24 divisors (see below), whose sum is σ = 30563520. Its totient is φ = 12725856.

The previous prime is 20116871. The next prime is 20116891. The reversal of 20116881 is 18861102.

It is an interprime number because it is at equal distance from previous prime (20116871) and next prime (20116891).

It is not a de Polignac number, because 20116881 - 2⁵ = 20116849 is a prime.

It is a super-2 number, since 2×20116881² = 809377802336322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20116841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32190 + ... + 32808.

It is an arithmetic number, because the mean of its divisors is an integer number (1273480).

Almost surely, 2^20116881 is an apocalyptic number.

It is an amenable number.

20116881 is a deficient number, since it is larger than the sum of its proper divisors (10446639).

20116881 is a wasteful number, since it uses less digits than its factorization.

20116881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 802 counting only the distinct ones).

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

The square root of 20116881 is about 4485.1846115851. The cubic root of 20116881 is about 271.9695080078.

Adding to 20116881 its reverse (18861102), we get a palindrome (38977983).

The spelling of 20116881 in words is "twenty million, one hundred sixteen thousand, eight hundred eighty-one".