19928861760 has 56 divisors (see below), whose sum is σ = 63274139136. Its totient is φ = 5314362880.

The previous prime is 19928861753. The next prime is 19928861783. The reversal of 19928861760 is 6716882991.

It is a self number, because there is not a number n which added to its sum of digits gives 19928861760.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10378656 + ... + 10380575.

Almost surely, 2^19928861760 is an apocalyptic number.

19928861760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19928861760 is an abundant number, since it is smaller than the sum of its proper divisors (43345277376).

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

19928861760 is a wasteful number, since it uses less digits than its factorization.

19928861760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20759251 (or 20759241 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 57.

The spelling of 19928861760 in words is "nineteen billion, nine hundred twenty-eight million, eight hundred sixty-one thousand, seven hundred sixty".