19894433632 has 12 divisors (see below), whose sum is σ = 39167166276. Its totient is φ = 9947216800.

The previous prime is 19894433609. The next prime is 19894433633. The reversal of 19894433632 is 23633449891.

It is a happy number.

It is a super-2 number, since 2×19894433632² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19894433632.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19894433633) 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 as a sum of consecutive naturals, namely, 310850494 + ... + 310850557.

It is an arithmetic number, because the mean of its divisors is an integer number (3263930523).

Almost surely, 2^19894433632 is an apocalyptic number.

It is an amenable number.

19894433632 is a deficient number, since it is larger than the sum of its proper divisors (19272732644).

19894433632 is an equidigital number, since it uses as much as digits as its factorization.

19894433632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621701061 (or 621701053 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 52.

The spelling of 19894433632 in words is "nineteen billion, eight hundred ninety-four million, four hundred thirty-three thousand, six hundred thirty-two".