19806855 has 16 divisors (see below), whose sum is σ = 32784480. Its totient is φ = 10199168.

The previous prime is 19806851. The next prime is 19806859. The reversal of 19806855 is 55860891.

It is an interprime number because it is at equal distance from previous prime (19806851) and next prime (19806859).

It is a cyclic number.

It is not a de Polignac number, because 19806855 - 2² = 19806851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19806851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22332 + ... + 23201.

It is an arithmetic number, because the mean of its divisors is an integer number (2049030).

Almost surely, 2^19806855 is an apocalyptic number.

19806855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19806855 is a deficient number, since it is larger than the sum of its proper divisors (12977625).

19806855 is a wasteful number, since it uses less digits than its factorization.

19806855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45570.

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

The square root of 19806855 is about 4450.4892989423. The cubic root of 19806855 is about 270.5651400050.

The spelling of 19806855 in words is "nineteen million, eight hundred six thousand, eight hundred fifty-five".