19805452285784 has 128 divisors (see below), whose sum is σ = 41057957445120. Its totient is φ = 8881593446400.

The previous prime is 19805452285763. The next prime is 19805452285819. The reversal of 19805452285784 is 48758225450891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5615380229 + ... + 5615383755.

It is an arithmetic number, because the mean of its divisors is an integer number (320765292540).

Almost surely, 2^{19805452285784} 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 19805452285784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20528978722560).

19805452285784 is an abundant number, since it is smaller than the sum of its proper divisors (21252505159336).

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

19805452285784 is a wasteful number, since it uses less digits than its factorization.

19805452285784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529 (or 5525 counting only the distinct ones).

The product of its (nonzero) digits is 258048000, while the sum is 68.

The spelling of 19805452285784 in words is "nineteen trillion, eight hundred five billion, four hundred fifty-two million, two hundred eighty-five thousand, seven hundred eighty-four".