19886881 has 16 divisors (see below), whose sum is σ = 23904000. Its totient is φ = 16175808.

The previous prime is 19886857. The next prime is 19886891. The reversal of 19886881 is 18868891.

It is not a de Polignac number, because 19886881 - 2¹¹ = 19884833 is a prime.

It is a super-2 number, since 2×19886881² = 790976071816322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19886831) 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 15 ways as a sum of consecutive naturals, for example, 23575 + ... + 24403.

It is an arithmetic number, because the mean of its divisors is an integer number (1494000).

Almost surely, 2^19886881 is an apocalyptic number.

It is an amenable number.

19886881 is a deficient number, since it is larger than the sum of its proper divisors (4017119).

19886881 is a wasteful number, since it uses less digits than its factorization.

19886881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008.

The product of its digits is 221184, while the sum is 49.

The square root of 19886881 is about 4459.4709327453. The cubic root of 19886881 is about 270.9290401213.

The spelling of 19886881 in words is "nineteen million, eight hundred eighty-six thousand, eight hundred eighty-one".