19897446144 has 72 divisors (see below), whose sum is σ = 52979433472. Its totient is φ = 6629575680.

The previous prime is 19897446109. The next prime is 19897446169. The reversal of 19897446144 is 44164479891.

It is a congruent number.

It is an unprimeable number.

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, 2425089 + ... + 2433279.

Almost surely, 2^19897446144 is an apocalyptic number.

It is an amenable number.

19897446144 is an abundant number, since it is smaller than the sum of its proper divisors (33081987328).

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

19897446144 is an equidigital number, since it uses as much as digits as its factorization.

19897446144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11373 (or 11359 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 57.

The spelling of 19897446144 in words is "nineteen billion, eight hundred ninety-seven million, four hundred forty-six thousand, one hundred forty-four".