19685380320 has 192 divisors, whose sum is σ = 69127914240. Its totient is φ = 5231983104.

The previous prime is 19685380303. The next prime is 19685380327. The reversal of 19685380320 is 2308358691.

It is a happy number.

19685380320 is a `hidden beast` number, since 1 + 96 + 8 + 538 + 0 + 3 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19685380327) 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, 1318819 + ... + 1333661.

It is an arithmetic number, because the mean of its divisors is an integer number (360041220).

Almost surely, 2^19685380320 is an apocalyptic number.

19685380320 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 19685380320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34563957120).

19685380320 is an abundant number, since it is smaller than the sum of its proper divisors (49442533920).

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

19685380320 is a wasteful number, since it uses less digits than its factorization.

19685380320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15174 (or 15160 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 19685380320 in words is "nineteen billion, six hundred eighty-five million, three hundred eighty thousand, three hundred twenty".