19905489520 has 60 divisors (see below), whose sum is σ = 53836235064. Its totient is φ = 6824737920.

The previous prime is 19905489493. The next prime is 19905489581. The reversal of 19905489520 is 2598450991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2535046 + ... + 2542885.

Almost surely, 2^19905489520 is an apocalyptic number.

19905489520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19905489520 is an abundant number, since it is smaller than the sum of its proper divisors (33930745544).

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

19905489520 is a wasteful number, since it uses less digits than its factorization.

19905489520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077958 (or 5077945 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 19905489520 in words is "nineteen billion, nine hundred five million, four hundred eighty-nine thousand, five hundred twenty".