19887219660 has 192 divisors, whose sum is σ = 69574901760. Its totient is φ = 4123457280.

The previous prime is 19887219637. The next prime is 19887219661. The reversal of 19887219660 is 6691278891.

It is a self number, because there is not a number n which added to its sum of digits gives 19887219660.

It is not an unprimeable number, because it can be changed into a prime (19887219661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2245521 + ... + 2254359.

It is an arithmetic number, because the mean of its divisors is an integer number (362369280).

Almost surely, 2^19887219660 is an apocalyptic number.

19887219660 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 19887219660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34787450880).

19887219660 is an abundant number, since it is smaller than the sum of its proper divisors (49687682100).

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

19887219660 is a wasteful number, since it uses less digits than its factorization.

19887219660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9356 (or 9354 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 57.

The spelling of 19887219660 in words is "nineteen billion, eight hundred eighty-seven million, two hundred nineteen thousand, six hundred sixty".