19803855 has 16 divisors (see below), whose sum is σ = 31762944. Its totient is φ = 10536480.

The previous prime is 19803841. The next prime is 19803857. The reversal of 19803855 is 55830891.

It is not a de Polignac number, because 19803855 - 2⁷ = 19803727 is a prime.

It is a super-2 number, since 2×19803855² = 784385345722050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19803857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5950 + ... + 8660.

It is an arithmetic number, because the mean of its divisors is an integer number (1985184).

Almost surely, 2^19803855 is an apocalyptic number.

19803855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19803855 is a deficient number, since it is larger than the sum of its proper divisors (11959089).

19803855 is a wasteful number, since it uses less digits than its factorization.

19803855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 19803855 is about 4450.1522445867. The cubic root of 19803855 is about 270.5514791385.

The spelling of 19803855 in words is "nineteen million, eight hundred three thousand, eight hundred fifty-five".