19746966720 has 224 divisors, whose sum is σ = 67848480000. Its totient is φ = 4837109760.

The previous prime is 19746966713. The next prime is 19746966773. The reversal of 19746966720 is 2766964791.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2629531 + ... + 2637029.

It is an arithmetic number, because the mean of its divisors is an integer number (302895000).

Almost surely, 2^19746966720 is an apocalyptic number.

19746966720 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 19746966720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33924240000).

19746966720 is an abundant number, since it is smaller than the sum of its proper divisors (48101513280).

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

19746966720 is a wasteful number, since it uses less digits than its factorization.

19746966720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743 (or 7733 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 57.

The spelling of 19746966720 in words is "nineteen billion, seven hundred forty-six million, nine hundred sixty-six thousand, seven hundred twenty".