19906277568 has 112 divisors (see below), whose sum is σ = 55863439200. Its totient is φ = 6234292224.

The previous prime is 19906277543. The next prime is 19906277569. The reversal of 19906277568 is 86577260991.

It is a super-2 number, since 2×19906277568² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19906277569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995858 + ... + 2005806.

Almost surely, 2^19906277568 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 19906277568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27931719600).

19906277568 is an abundant number, since it is smaller than the sum of its proper divisors (35957161632).

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

19906277568 is a wasteful number, since it uses less digits than its factorization.

19906277568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10594 (or 10584 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 60.

The spelling of 19906277568 in words is "nineteen billion, nine hundred six million, two hundred seventy-seven thousand, five hundred sixty-eight".