19808085 has 16 divisors (see below), whose sum is σ = 34574400. Its totient is φ = 9603840.

The previous prime is 19808071. The next prime is 19808123. The reversal of 19808085 is 58080891.

It is not a de Polignac number, because 19808085 - 2⁵ = 19808053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59860 + ... + 60189.

It is an arithmetic number, because the mean of its divisors is an integer number (2160900).

Almost surely, 2^19808085 is an apocalyptic number.

19808085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19808085 is a deficient number, since it is larger than the sum of its proper divisors (14766315).

19808085 is a wasteful number, since it uses less digits than its factorization.

19808085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120068.

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 19808085 is about 4450.6274838499. The cubic root of 19808085 is about 270.5707405615.

The spelling of 19808085 in words is "nineteen million, eight hundred eight thousand, eighty-five".