20366505321220 has 48 divisors (see below), whose sum is σ = 44174091322368. Its totient is φ = 7879386430080.

The previous prime is 20366505321203. The next prime is 20366505321223. The reversal of 20366505321220 is 2212350566302.

It is a self number, because there is not a number n which added to its sum of digits gives 20366505321220.

It is not an unprimeable number, because it can be changed into a prime (20366505321223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8106319 + ... + 10317238.

It is an arithmetic number, because the mean of its divisors is an integer number (920293569216).

Almost surely, 2^{20366505321220} is an apocalyptic number.

20366505321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20366505321220 is an abundant number, since it is smaller than the sum of its proper divisors (23807586001148).

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

20366505321220 is a wasteful number, since it uses less digits than its factorization.

20366505321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18425380 (or 18425378 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 20366505321220 its reverse (2212350566302), we get a palindrome (22578855887522).

The spelling of 20366505321220 in words is "twenty trillion, three hundred sixty-six billion, five hundred five million, three hundred twenty-one thousand, two hundred twenty".