19707438240 has 384 divisors, whose sum is σ = 79196382720. Its totient is φ = 4483620864.

The previous prime is 19707438239. The next prime is 19707438281. The reversal of 19707438240 is 4283470791.

19707438240 is a `hidden beast` number, since 197 + 0 + 7 + 438 + 24 + 0 = 666.

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

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, 7044522 + ... + 7047318.

It is an arithmetic number, because the mean of its divisors is an integer number (206240580).

Almost surely, 2^19707438240 is an apocalyptic number.

19707438240 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 19707438240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39598191360).

19707438240 is an abundant number, since it is smaller than the sum of its proper divisors (59488944480).

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

19707438240 is a wasteful number, since it uses less digits than its factorization.

19707438240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3061 (or 3047 counting only the distinct ones).

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

The spelling of 19707438240 in words is "nineteen billion, seven hundred seven million, four hundred thirty-eight thousand, two hundred forty".