19923691366720 has 56 divisors (see below), whose sum is σ = 47443813045128. Its totient is φ = 7969388697600.

The previous prime is 19923691366703. The next prime is 19923691366753. The reversal of 19923691366720 is 2766319632991.

It can be written as a sum of positive squares in 4 ways, for example, as 5645147906304 + 14278543460416 = 2375952^2 + 3778696^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34136550 + ... + 34715290.

Almost surely, 2^{19923691366720} is an apocalyptic number.

19923691366720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19923691366720 is an abundant number, since it is smaller than the sum of its proper divisors (27520121678408).

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

19923691366720 is a wasteful number, since it uses less digits than its factorization.

19923691366720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686339 (or 686329 counting only the distinct ones).

The product of its (nonzero) digits is 39680928, while the sum is 64.

The spelling of 19923691366720 in words is "nineteen trillion, nine hundred twenty-three billion, six hundred ninety-one million, three hundred sixty-six thousand, seven hundred twenty".