19993311 has 24 divisors (see below), whose sum is σ = 32257680. Its totient is φ = 12301632.

The previous prime is 19993297. The next prime is 19993319. The reversal of 19993311 is 11339991.

It is a de Polignac number, because none of the positive numbers 2^k-19993311 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19993319) 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 23 ways as a sum of consecutive naturals, for example, 6 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (1344070).

Almost surely, 2^19993311 is an apocalyptic number.

19993311 is a deficient number, since it is larger than the sum of its proper divisors (12264369).

19993311 is an equidigital number, since it uses as much as digits as its factorization.

19993311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6357 (or 6345 counting only the distinct ones).

The product of its digits is 6561, while the sum is 36.

The square root of 19993311 is about 4471.3880395242. The cubic root of 19993311 is about 271.4114970528.

The spelling of 19993311 in words is "nineteen million, nine hundred ninety-three thousand, three hundred eleven".