19981085 has 8 divisors (see below), whose sum is σ = 24034560. Its totient is φ = 15946704.

The previous prime is 19981079. The next prime is 19981109. The reversal of 19981085 is 58018991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19981085 - 2⁶ = 19981021 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2357 + ... + 6746.

It is an arithmetic number, because the mean of its divisors is an integer number (3004320).

Almost surely, 2^19981085 is an apocalyptic number.

It is an amenable number.

19981085 is a deficient number, since it is larger than the sum of its proper divisors (4053475).

19981085 is an equidigital number, since it uses as much as digits as its factorization.

19981085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9547.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 19981085 is about 4470.0206934644. The cubic root of 19981085 is about 271.3561626534.

The spelling of 19981085 in words is "nineteen million, nine hundred eighty-one thousand, eighty-five".