19966855 has 8 divisors (see below), whose sum is σ = 24264000. Its totient is φ = 15770976.

The previous prime is 19966847. The next prime is 19966861. The reversal of 19966855 is 55866991.

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 19966855 - 2³ = 19966847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19966799 and 19966808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24880 + ... + 25669.

It is an arithmetic number, because the mean of its divisors is an integer number (3033000).

Almost surely, 2^19966855 is an apocalyptic number.

19966855 is a deficient number, since it is larger than the sum of its proper divisors (4297145).

19966855 is an equidigital number, since it uses as much as digits as its factorization.

19966855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50633.

The product of its digits is 583200, while the sum is 49.

The square root of 19966855 is about 4468.4286947427. The cubic root of 19966855 is about 271.2917297957.

The spelling of 19966855 in words is "nineteen million, nine hundred sixty-six thousand, eight hundred fifty-five".