19723827625840 has 80 divisors (see below), whose sum is σ = 50720171388768. Its totient is φ = 7085815815168.

The previous prime is 19723827625823. The next prime is 19723827625861. The reversal of 19723827625840 is 4852672832791.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256248262 + ... + 256325221.

It is a 2-persistent number, because it is pandigital, and so is 2⋅19723827625840 = 39447655251680, but 3⋅19723827625840 = 59171482877520 is not.

Almost surely, 2^{19723827625840} is an apocalyptic number.

19723827625840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19723827625840 is an abundant number, since it is smaller than the sum of its proper divisors (30996343762928).

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

19723827625840 is a wasteful number, since it uses less digits than its factorization.

19723827625840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512573546 (or 512573540 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 64.

The spelling of 19723827625840 in words is "nineteen trillion, seven hundred twenty-three billion, eight hundred twenty-seven million, six hundred twenty-five thousand, eight hundred forty".