19974366720 has 1120 divisors, whose sum is σ = 90166728960. Its totient is φ = 4120657920.

The previous prime is 19974366719. The next prime is 19974366749. The reversal of 19974366720 is 2766347991.

It is a happy number.

19974366720 is a `hidden beast` number, since 199 + 74 + 366 + 7 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 143700411 + ... + 143700549.

It is an arithmetic number, because the mean of its divisors is an integer number (80506008).

Almost surely, 2^19974366720 is an apocalyptic number.

19974366720 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 19974366720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45083364480).

19974366720 is an abundant number, since it is smaller than the sum of its proper divisors (70192362240).

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

19974366720 is an equidigital number, since it uses as much as digits as its factorization.

19974366720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 19974366720 in words is "nineteen billion, nine hundred seventy-four million, three hundred sixty-six thousand, seven hundred twenty".