19971362748 has 96 divisors (see below), whose sum is σ = 51089246208. Its totient is φ = 6044774400.

The previous prime is 19971362711. The next prime is 19971362753. The reversal of 19971362748 is 84726317991.

It is a happy number.

It is a super-2 number, since 2×19971362748² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2126503 + ... + 2135873.

It is an arithmetic number, because the mean of its divisors is an integer number (532179648).

Almost surely, 2^19971362748 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 19971362748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25544623104).

19971362748 is an abundant number, since it is smaller than the sum of its proper divisors (31117883460).

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

19971362748 is a wasteful number, since it uses less digits than its factorization.

19971362748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9763 (or 9761 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 57.

The spelling of 19971362748 in words is "nineteen billion, nine hundred seventy-one million, three hundred sixty-two thousand, seven hundred forty-eight".