19447280045920 has 192 divisors, whose sum is σ = 50935174012800. Its totient is φ = 6979102670848.

The previous prime is 19447280045917. The next prime is 19447280045927. The reversal of 19447280045920 is 2954008274491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19447280045927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17799606 + ... + 18860554.

It is an arithmetic number, because the mean of its divisors is an integer number (265287364650).

Almost surely, 2^{19447280045920} is an apocalyptic number.

19447280045920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19447280045920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25467587006400).

19447280045920 is an abundant number, since it is smaller than the sum of its proper divisors (31487893966880).

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

19447280045920 is a wasteful number, since it uses less digits than its factorization.

19447280045920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061297 (or 1061289 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 19447280045920 in words is "nineteen trillion, four hundred forty-seven billion, two hundred eighty million, forty-five thousand, nine hundred twenty".