19705463808 has 352 divisors, whose sum is σ = 58010342400. Its totient is φ = 5926846464.

The previous prime is 19705463807. The next prime is 19705463839. The reversal of 19705463808 is 80836450791.

It is not an unprimeable number, because it can be changed into a prime (19705463801) 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, 120892335 + ... + 120892497.

Almost surely, 2^19705463808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19705463808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29005171200).

19705463808 is an abundant number, since it is smaller than the sum of its proper divisors (38304878592).

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

19705463808 is a wasteful number, since it uses less digits than its factorization.

19705463808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 279 counting only the distinct ones).

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

The spelling of 19705463808 in words is "nineteen billion, seven hundred five million, four hundred sixty-three thousand, eight hundred eight".