19780474320 has 320 divisors, whose sum is σ = 69873623040. Its totient is φ = 5141740032.

The previous prime is 19780474319. The next prime is 19780474391. The reversal of 19780474320 is 2347408791.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14905497 + ... + 14906823.

It is an arithmetic number, because the mean of its divisors is an integer number (218355072).

Almost surely, 2^19780474320 is an apocalyptic number.

19780474320 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 19780474320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34936811520).

19780474320 is an abundant number, since it is smaller than the sum of its proper divisors (50093148720).

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

19780474320 is a wasteful number, since it uses less digits than its factorization.

19780474320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 19780474320 in words is "nineteen billion, seven hundred eighty million, four hundred seventy-four thousand, three hundred twenty".