20311321220 has 12 divisors (see below), whose sum is σ = 42653774604. Its totient is φ = 8124528480.

The previous prime is 20311321189. The next prime is 20311321253. The reversal of 20311321220 is 2212311302.

It can be written as a sum of positive squares in 2 ways, for example, as 2252261764 + 18059059456 = 47458^2 + 134384^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507783011 + ... + 507783050.

It is an arithmetic number, because the mean of its divisors is an integer number (3554481217).

Almost surely, 2^20311321220 is an apocalyptic number.

20311321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311321220 is an abundant number, since it is smaller than the sum of its proper divisors (22342453384).

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

20311321220 is a wasteful number, since it uses less digits than its factorization.

20311321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015566070 (or 1015566068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20311321220 its reverse (2212311302), we get a palindrome (22523632522).

The spelling of 20311321220 in words is "twenty billion, three hundred eleven million, three hundred twenty-one thousand, two hundred twenty".