19966814 has 24 divisors (see below), whose sum is σ = 35329968. Its totient is φ = 8436960.

The previous prime is 19966811. The next prime is 19966831. The reversal of 19966814 is 41866991.

It is a super-2 number, since 2×19966814² = 797347322621192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19966811) 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 11 ways as a sum of consecutive naturals, for example, 5759 + ... + 8549.

It is an arithmetic number, because the mean of its divisors is an integer number (1472082).

Almost surely, 2^19966814 is an apocalyptic number.

19966814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19966814 is a deficient number, since it is larger than the sum of its proper divisors (15363154).

19966814 is a wasteful number, since it uses less digits than its factorization.

19966814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880 (or 2873 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 19966814 is about 4468.4241069979. The cubic root of 19966814 is about 271.2915441051.

The spelling of 19966814 in words is "nineteen million, nine hundred sixty-six thousand, eight hundred fourteen".