19946390741680 has 120 divisors (see below), whose sum is σ = 50339898308160. Its totient is φ = 7346812262400.

The previous prime is 19946390741663. The next prime is 19946390741713. The reversal of 19946390741680 is 8614709364991.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3726105 + ... + 7333255.

It is an arithmetic number, because the mean of its divisors is an integer number (419499152568).

Almost surely, 2^{19946390741680} is an apocalyptic number.

19946390741680 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 19946390741680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25169949154080).

19946390741680 is an abundant number, since it is smaller than the sum of its proper divisors (30393507566480).

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

19946390741680 is a wasteful number, since it uses less digits than its factorization.

19946390741680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607599 (or 3607580 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 67.

The spelling of 19946390741680 in words is "nineteen trillion, nine hundred forty-six billion, three hundred ninety million, seven hundred forty-one thousand, six hundred eighty".