19891483904 has 72 divisors (see below), whose sum is σ = 40757196480. Its totient is φ = 9683251200.

The previous prime is 19891483883. The next prime is 19891483943. The reversal of 19891483904 is 40938419891.

It is a super-2 number, since 2×19891483904² (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 19891483904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5991557 + ... + 5994875.

Almost surely, 2^19891483904 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 19891483904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20378598240).

19891483904 is an abundant number, since it is smaller than the sum of its proper divisors (20865712576).

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

19891483904 is an equidigital number, since it uses as much as digits as its factorization.

19891483904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947 (or 3933 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 19891483904 in words is "nineteen billion, eight hundred ninety-one million, four hundred eighty-three thousand, nine hundred four".