19666230 has 16 divisors (see below), whose sum is σ = 47199024. Its totient is φ = 5244320.

The previous prime is 19666211. The next prime is 19666237. The reversal of 19666230 is 3266691.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19666191 and 19666200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19666237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327741 + ... + 327800.

It is an arithmetic number, because the mean of its divisors is an integer number (2949939).

Almost surely, 2^19666230 is an apocalyptic number.

19666230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19666230 is an abundant number, since it is smaller than the sum of its proper divisors (27532794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19666230 is a wasteful number, since it uses less digits than its factorization.

19666230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655551.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 19666230 is about 4434.6623321286. The cubic root of 19666230 is about 269.9232978283.

The spelling of 19666230 in words is "nineteen million, six hundred sixty-six thousand, two hundred thirty".