20173105332780 has 144 divisors (see below), whose sum is σ = 58510676034720. Its totient is φ = 5193012156416.

The previous prime is 20173105332767. The next prime is 20173105332791. The reversal of 20173105332780 is 8723350137102.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 288444856 + ... + 288514784.

It is an arithmetic number, because the mean of its divisors is an integer number (406324139130).

Almost surely, 2^{20173105332780} is an apocalyptic number.

20173105332780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20173105332780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29255338017360).

20173105332780 is an abundant number, since it is smaller than the sum of its proper divisors (38337570701940).

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

20173105332780 is a wasteful number, since it uses less digits than its factorization.

20173105332780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75716 (or 75685 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

Adding to 20173105332780 its reverse (8723350137102), we get a palindrome (28896455469882).

The spelling of 20173105332780 in words is "twenty trillion, one hundred seventy-three billion, one hundred five million, three hundred thirty-two thousand, seven hundred eighty".