19889748946 has 16 divisors (see below), whose sum is σ = 30782332800. Its totient is φ = 9633721968.

The previous prime is 19889748917. The next prime is 19889748947. The reversal of 19889748946 is 64984798891.

It is a super-2 number, since 2×19889748946² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19889748947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1179216 + ... + 1195963.

It is an arithmetic number, because the mean of its divisors is an integer number (1923895800).

Almost surely, 2^19889748946 is an apocalyptic number.

19889748946 is a deficient number, since it is larger than the sum of its proper divisors (10892583854).

19889748946 is a wasteful number, since it uses less digits than its factorization.

19889748946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375313.

The product of its digits is 250822656, while the sum is 73.

The spelling of 19889748946 in words is "nineteen billion, eight hundred eighty-nine million, seven hundred forty-eight thousand, nine hundred forty-six".