19855086 has 16 divisors (see below), whose sum is σ = 39859968. Its totient is φ = 6593400.

The previous prime is 19855061. The next prime is 19855123. The reversal of 19855086 is 68055891.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4480 + ... + 7731.

It is an arithmetic number, because the mean of its divisors is an integer number (2491248).

Almost surely, 2^19855086 is an apocalyptic number.

19855086 is an abundant number, since it is smaller than the sum of its proper divisors (20004882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19855086 is a wasteful number, since it uses less digits than its factorization.

19855086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12487.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 19855086 is about 4455.9046219595. The cubic root of 19855086 is about 270.7845766485.

The spelling of 19855086 in words is "nineteen million, eight hundred fifty-five thousand, eighty-six".