19494827520 has 640 divisors, whose sum is σ = 76621095936. Its totient is φ = 4127195136.

The previous prime is 19494827509. The next prime is 19494827549. The reversal of 19494827520 is 2572849491.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 75855232 + ... + 75855488.

Almost surely, 2^19494827520 is an apocalyptic number.

19494827520 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 19494827520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38310547968).

19494827520 is an abundant number, since it is smaller than the sum of its proper divisors (57126268416).

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

19494827520 is a wasteful number, since it uses less digits than its factorization.

19494827520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 19494827520 in words is "nineteen billion, four hundred ninety-four million, eight hundred twenty-seven thousand, five hundred twenty".