19820214784 has 20 divisors (see below), whose sum is σ = 39601719234. Its totient is φ = 9910107136.

The previous prime is 19820214751. The next prime is 19820214809. The reversal of 19820214784 is 48741202891.

It can be written as a sum of positive squares in only one way, i.e., 14852784384 + 4967430400 = 121872^2 + 70480^2 .

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 as a sum of consecutive naturals, namely, 19355167 + ... + 19356190.

Almost surely, 2^19820214784 is an apocalyptic number.

It is an amenable number.

19820214784 is a deficient number, since it is larger than the sum of its proper divisors (19781504450).

19820214784 is an frugal number, since it uses more digits than its factorization.

19820214784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38711375 (or 38711359 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 19820214784 in words is "nineteen billion, eight hundred twenty million, two hundred fourteen thousand, seven hundred eighty-four".