19764642536020 has 48 divisors (see below), whose sum is σ = 41566522636800. Its totient is φ = 7894282354560.

The previous prime is 19764642535999. The next prime is 19764642536021. The reversal of 19764642536020 is 2063524646791.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19764642536021) 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, 493713405 + ... + 493753435.

It is an arithmetic number, because the mean of its divisors is an integer number (865969221600).

Almost surely, 2^{19764642536020} is an apocalyptic number.

19764642536020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19764642536020 is an abundant number, since it is smaller than the sum of its proper divisors (21801880100780).

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

19764642536020 is a wasteful number, since it uses less digits than its factorization.

19764642536020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75568 (or 75566 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 19764642536020 in words is "nineteen trillion, seven hundred sixty-four billion, six hundred forty-two million, five hundred thirty-six thousand, twenty".