19841520412 has 72 divisors (see below), whose sum is σ = 42563628240. Its totient is φ = 8047226880.

The previous prime is 19841520371. The next prime is 19841520421. The reversal of 19841520412 is 21402514891.

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 23 ways as a sum of consecutive naturals, for example, 4291462 + ... + 4296082.

Almost surely, 2^19841520412 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19841520412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21281814120).

19841520412 is an abundant number, since it is smaller than the sum of its proper divisors (22722107828).

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

19841520412 is a wasteful number, since it uses less digits than its factorization.

19841520412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5811 (or 5802 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 19841520412 in words is "nineteen billion, eight hundred forty-one million, five hundred twenty thousand, four hundred twelve".