19709845128220 has 48 divisors (see below), whose sum is σ = 44575055769888. Its totient is φ = 7277402430720.

The previous prime is 19709845128101. The next prime is 19709845128227. The reversal of 19709845128220 is 2282154890791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19709845128227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27194782 + ... + 27910138.

It is an arithmetic number, because the mean of its divisors is an integer number (928646995206).

Almost surely, 2^{19709845128220} is an apocalyptic number.

19709845128220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19709845128220 is an abundant number, since it is smaller than the sum of its proper divisors (24865210641668).

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

19709845128220 is a wasteful number, since it uses less digits than its factorization.

19709845128220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821350 (or 821348 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 19709845128220 in words is "nineteen trillion, seven hundred nine billion, eight hundred forty-five million, one hundred twenty-eight thousand, two hundred twenty".