20312311321220 has 48 divisors (see below), whose sum is σ = 43854685480368. Its totient is φ = 7897036492800.

The previous prime is 20312311321217. The next prime is 20312311321223. The reversal of 20312311321220 is 2212311321302.

It is an interprime number because it is at equal distance from previous prime (20312311321217) and next prime (20312311321223).

It can be written as a sum of positive squares in 8 ways, for example, as 84211396864 + 20228099924356 = 290192^2 + 4497566^2 .

It is not an unprimeable number, because it can be changed into a prime (20312311321223) 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, 13696181 + ... + 15106620.

It is an arithmetic number, because the mean of its divisors is an integer number (913639280841).

Almost surely, 2^{20312311321220} is an apocalyptic number.

20312311321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312311321220 is an abundant number, since it is smaller than the sum of its proper divisors (23542374159148).

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

20312311321220 is a wasteful number, since it uses less digits than its factorization.

20312311321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28803800 (or 28803798 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20312311321220 its reverse (2212311321302), we get a palindrome (22524622642522).

The spelling of 20312311321220 in words is "twenty trillion, three hundred twelve billion, three hundred eleven million, three hundred twenty-one thousand, two hundred twenty".