19923855476640 has 96 divisors (see below), whose sum is σ = 63211656795840. Its totient is φ = 5274804885504.

The previous prime is 19923855476627. The next prime is 19923855476641. The reversal of 19923855476640 is 4667455832991.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (19923855476641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149242749 + ... + 149376188.

It is an arithmetic number, because the mean of its divisors is an integer number (658454758290).

It is a 1-persistent number, because it is pandigital, but 2⋅19923855476640 = 39847710953280 is not.

Almost surely, 2^{19923855476640} is an apocalyptic number.

19923855476640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19923855476640 is an abundant number, since it is smaller than the sum of its proper divisors (43287801319200).

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

19923855476640 is a wasteful number, since it uses less digits than its factorization.

19923855476640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298619094 (or 298619086 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 69.

The spelling of 19923855476640 in words is "nineteen trillion, nine hundred twenty-three billion, eight hundred fifty-five million, four hundred seventy-six thousand, six hundred forty".