19820738 has 16 divisors (see below), whose sum is σ = 34038144. Its totient is φ = 8479680.

The previous prime is 19820737. The next prime is 19820747. The reversal of 19820738 is 83702891.

It is not an unprimeable number, because it can be changed into a prime (19820737) 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, 11531 + ... + 13137.

It is an arithmetic number, because the mean of its divisors is an integer number (2127384).

Almost surely, 2^19820738 is an apocalyptic number.

19820738 is a deficient number, since it is larger than the sum of its proper divisors (14217406).

19820738 is a wasteful number, since it uses less digits than its factorization.

19820738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 19820738 is about 4452.0487418715. The cubic root of 19820738 is about 270.6283399858.

The spelling of 19820738 in words is "nineteen million, eight hundred twenty thousand, seven hundred thirty-eight".