19855555 has 8 divisors (see below), whose sum is σ = 24862752. Its totient is φ = 15193728.

The previous prime is 19855543. The next prime is 19855559. The reversal of 19855555 is 55555891.

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 19855555 - 2⁵ = 19855523 is a prime.

It is a Duffinian number.

19855555 is a modest number, since divided by 5555 gives 1985 as remainder.

It is not an unprimeable number, because it can be changed into a prime (19855559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86214 + ... + 86443.

It is an arithmetic number, because the mean of its divisors is an integer number (3107844).

Almost surely, 2^19855555 is an apocalyptic number.

19855555 is a deficient number, since it is larger than the sum of its proper divisors (5007197).

19855555 is a wasteful number, since it uses less digits than its factorization.

19855555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172685.

The product of its digits is 225000, while the sum is 43.

The square root of 19855555 is about 4455.9572484484. The cubic root of 19855555 is about 270.7867087129.

The spelling of 19855555 in words is "nineteen million, eight hundred fifty-five thousand, five hundred fifty-five".