19605995520 has 120 divisors (see below), whose sum is σ = 62738057424. Its totient is φ = 5228199936.

The previous prime is 19605995441. The next prime is 19605995579. The reversal of 19605995520 is 2559950691.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

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, 205872 + ... + 285648.

Almost surely, 2^19605995520 is an apocalyptic number.

19605995520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19605995520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31369028712).

19605995520 is an abundant number, since it is smaller than the sum of its proper divisors (43132061904).

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

19605995520 is an frugal number, since it uses more digits than its factorization.

19605995520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79813 (or 79787 counting only the distinct ones).

The product of its (nonzero) digits is 1093500, while the sum is 51.

The spelling of 19605995520 in words is "nineteen billion, six hundred five million, nine hundred ninety-five thousand, five hundred twenty".