19999994757120 has 2400 divisors, whose sum is σ = 86836505107968. Its totient is φ = 4305167843328.

The previous prime is 19999994757109. The next prime is 19999994757157. The reversal of 19999994757120 is 2175749999991.

19999994757120 is a `hidden beast` number, since 19 + 9 + 9 + 9 + 9 + 9 + 4 + 7 + 571 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 19999994757120.

It is a congruent number.

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 103626915744 + ... + 103626915936.

Almost surely, 2^{19999994757120} is an apocalyptic number.

19999994757120 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 19999994757120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43418252553984).

19999994757120 is an abundant number, since it is smaller than the sum of its proper divisors (66836510350848).

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

19999994757120 is an equidigital number, since it uses as much as digits as its factorization.

19999994757120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 1041624360, while the sum is 81.

The spelling of 19999994757120 in words is "nineteen trillion, nine hundred ninety-nine billion, nine hundred ninety-four million, seven hundred fifty-seven thousand, one hundred twenty".