19800537596 has 54 divisors (see below), whose sum is σ = 40472916120. Its totient is φ = 8451404304.

The previous prime is 19800537563. The next prime is 19800537599. The reversal of 19800537596 is 69573500891.

It is a super-2 number, since 2×19800537596² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19800537599) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23599745 + ... + 23600583.

Almost surely, 2^19800537596 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 19800537596, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20236458060).

19800537596 is an abundant number, since it is smaller than the sum of its proper divisors (20672378524).

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

19800537596 is an equidigital number, since it uses as much as digits as its factorization.

19800537596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 19800537596 in words is "nineteen billion, eight hundred million, five hundred thirty-seven thousand, five hundred ninety-six".