19821682 has 16 divisors (see below), whose sum is σ = 30756672. Its totient is φ = 9575280.

The previous prime is 19821673. The next prime is 19821689. The reversal of 19821682 is 28612891.

It is not an unprimeable number, because it can be changed into a prime (19821689) 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 7 ways as a sum of consecutive naturals, for example, 5707 + ... + 8497.

It is an arithmetic number, because the mean of its divisors is an integer number (1922292).

Almost surely, 2^19821682 is an apocalyptic number.

19821682 is a deficient number, since it is larger than the sum of its proper divisors (10934990).

19821682 is a wasteful number, since it uses less digits than its factorization.

19821682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913.

The product of its digits is 13824, while the sum is 37.

The square root of 19821682 is about 4452.1547592149. The cubic root of 19821682 is about 270.6326363125.

It can be divided in two parts, 19821 and 682, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 19821682 in words is "nineteen million, eight hundred twenty-one thousand, six hundred eighty-two".