19805618480 has 40 divisors (see below), whose sum is σ = 46455589152. Its totient is φ = 7852135424.

The previous prime is 19805618453. The next prime is 19805618501. The reversal of 19805618480 is 8481650891.

It is a tau number, because it is divible by the number of its divisors (40).

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, 1086404 + ... + 1104483.

Almost surely, 2^19805618480 is an apocalyptic number.

19805618480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19805618480 is an abundant number, since it is smaller than the sum of its proper divisors (26649970672).

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

19805618480 is a wasteful number, since it uses less digits than its factorization.

19805618480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191013 (or 2191007 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 19805618480 in words is "nineteen billion, eight hundred five million, six hundred eighteen thousand, four hundred eighty".