19728205446 has 16 divisors (see below), whose sum is σ = 39570122304. Its totient is φ = 6557116584.

The previous prime is 19728205421. The next prime is 19728205451. The reversal of 19728205446 is 64450282791.

It is a junction number, because it is equal to n+sod(n) for n = 19728205395 and 19728205404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4735720 + ... + 4739883.

It is an arithmetic number, because the mean of its divisors is an integer number (2473132644).

Almost surely, 2^19728205446 is an apocalyptic number.

19728205446 is an abundant number, since it is smaller than the sum of its proper divisors (19841916858).

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

19728205446 is a wasteful number, since it uses less digits than its factorization.

19728205446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9475955.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 19728205446 in words is "nineteen billion, seven hundred twenty-eight million, two hundred five thousand, four hundred forty-six".