19988841 has 4 divisors (see below), whose sum is σ = 26651792. Its totient is φ = 13325892.

The previous prime is 19988833. The next prime is 19988849. The reversal of 19988841 is 14888991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (19988833) and next prime (19988849).

It is not a de Polignac number, because 19988841 - 2³ = 19988833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19988849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3331471 + ... + 3331476.

It is an arithmetic number, because the mean of its divisors is an integer number (6662948).

Almost surely, 2^19988841 is an apocalyptic number.

It is an amenable number.

19988841 is a deficient number, since it is larger than the sum of its proper divisors (6662951).

19988841 is an equidigital number, since it uses as much as digits as its factorization.

19988841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6662950.

The product of its digits is 165888, while the sum is 48.

The square root of 19988841 is about 4470.8881667964. Note that the first 3 decimals coincide. The cubic root of 19988841 is about 271.3912686238.

The spelling of 19988841 in words is "nineteen million, nine hundred eighty-eight thousand, eight hundred forty-one".