19497397920 has 1728 divisors, whose sum is σ = 92433374208. Its totient is φ = 3406233600.

The previous prime is 19497397867. The next prime is 19497397921. The reversal of 19497397920 is 2979379491.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19497397921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 628948305 + ... + 628948335.

It is an arithmetic number, because the mean of its divisors is an integer number (53491536).

Almost surely, 2^19497397920 is an apocalyptic number.

19497397920 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 19497397920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46216687104).

19497397920 is an abundant number, since it is smaller than the sum of its proper divisors (72935976288).

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

19497397920 is a wasteful number, since it uses less digits than its factorization.

19497397920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 7715736, while the sum is 60.

The spelling of 19497397920 in words is "nineteen billion, four hundred ninety-seven million, three hundred ninety-seven thousand, nine hundred twenty".