19730947785 has 16 divisors (see below), whose sum is σ = 32942104704. Its totient is φ = 10065642752.

The previous prime is 19730947777. The next prime is 19730947837. The reversal of 19730947785 is 58774903791.

It is a cyclic number.

It is not a de Polignac number, because 19730947785 - 2³ = 19730947777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28595232 + ... + 28595921.

It is an arithmetic number, because the mean of its divisors is an integer number (2058881544).

Almost surely, 2^19730947785 is an apocalyptic number.

19730947785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19730947785 is a deficient number, since it is larger than the sum of its proper divisors (13211156919).

19730947785 is a wasteful number, since it uses less digits than its factorization.

19730947785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57191184.

The product of its (nonzero) digits is 13335840, while the sum is 60.

The spelling of 19730947785 in words is "nineteen billion, seven hundred thirty million, nine hundred forty-seven thousand, seven hundred eighty-five".