19916085 has 64 divisors (see below), whose sum is σ = 39168000. Its totient is φ = 8439552.

The previous prime is 19916053. The next prime is 19916087. The reversal of 19916085 is 58061991.

It is not a de Polignac number, because 19916085 - 2⁵ = 19916053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19916087) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 133591 + ... + 133739.

It is an arithmetic number, because the mean of its divisors is an integer number (612000).

Almost surely, 2^19916085 is an apocalyptic number.

19916085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19916085 is a deficient number, since it is larger than the sum of its proper divisors (19251915).

19916085 is a wasteful number, since it uses less digits than its factorization.

19916085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 19916085 is about 4462.7441109703. The cubic root of 19916085 is about 271.0615955449.

The spelling of 19916085 in words is "nineteen million, nine hundred sixteen thousand, eighty-five".