19856055 has 8 divisors (see below), whose sum is σ = 31769712. Its totient is φ = 10589888.

The previous prime is 19856009. The next prime is 19856059. The reversal of 19856055 is 55065891.

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 19856055 - 2⁹ = 19855543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19856059) by changing a digit.

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, 661854 + ... + 661883.

It is an arithmetic number, because the mean of its divisors is an integer number (3971214).

Almost surely, 2^19856055 is an apocalyptic number.

19856055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19856055 is a deficient number, since it is larger than the sum of its proper divisors (11913657).

19856055 is a wasteful number, since it uses less digits than its factorization.

19856055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323745.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 19856055 is about 4456.0133527628. The cubic root of 19856055 is about 270.7889816657.

The spelling of 19856055 in words is "nineteen million, eight hundred fifty-six thousand, fifty-five".