20172169819152 has 720 divisors, whose sum is σ = 66641000258560. Its totient is φ = 5657090015232.

The previous prime is 20172169819147. The next prime is 20172169819183. The reversal of 20172169819152 is 25191896127102.

20172169819152 is a `hidden beast` number, since 201 + 7 + 216 + 98 + 1 + 91 + 52 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4463854749 + ... + 4463859267.

Almost surely, 2^{20172169819152} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20172169819152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33320500129280).

20172169819152 is an abundant number, since it is smaller than the sum of its proper divisors (46468830439408).

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

20172169819152 is a wasteful number, since it uses less digits than its factorization.

20172169819152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840 (or 4814 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The spelling of 20172169819152 in words is "twenty trillion, one hundred seventy-two billion, one hundred sixty-nine million, eight hundred nineteen thousand, one hundred fifty-two".