19688930 has 16 divisors (see below), whose sum is σ = 35502840. Its totient is φ = 7861632.

The previous prime is 19688927. The next prime is 19688953. The reversal of 19688930 is 3988691.

It can be written as a sum of positive squares in 4 ways, for example, as 8392609 + 11296321 = 2897^2 + 3361^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5702 + ... + 8478.

Almost surely, 2^19688930 is an apocalyptic number.

19688930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19688930 is a deficient number, since it is larger than the sum of its proper divisors (15813910).

19688930 is a wasteful number, since it uses less digits than its factorization.

19688930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493.

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

The square root of 19688930 is about 4437.2209771432. The cubic root of 19688930 is about 270.0271120465.

The spelling of 19688930 in words is "nineteen million, six hundred eighty-eight thousand, nine hundred thirty".