19720386 has 24 divisors (see below), whose sum is σ = 48831744. Its totient is φ = 5634360.

The previous prime is 19720343. The next prime is 19720397. The reversal of 19720386 is 68302791.

It is a self number, because there is not a number n which added to its sum of digits gives 19720386.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 78130 + ... + 78381.

It is an arithmetic number, because the mean of its divisors is an integer number (2034656).

Almost surely, 2^19720386 is an apocalyptic number.

19720386 is an abundant number, since it is smaller than the sum of its proper divisors (29111358).

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

19720386 is a wasteful number, since it uses less digits than its factorization.

19720386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156526 (or 156523 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 19720386 is about 4440.7641234364. The cubic root of 19720386 is about 270.1708383839.

The spelling of 19720386 in words is "nineteen million, seven hundred twenty thousand, three hundred eighty-six".