20315321220 has 96 divisors (see below), whose sum is σ = 57128779008. Its totient is φ = 5394068992.

The previous prime is 20315321209. The next prime is 20315321237. The reversal of 20315321220 is 2212351302.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 26280754 + ... + 26281526.

It is an arithmetic number, because the mean of its divisors is an integer number (595091448).

Almost surely, 2^20315321220 is an apocalyptic number.

20315321220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20315321220 is an abundant number, since it is smaller than the sum of its proper divisors (36813457788).

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

20315321220 is a wasteful number, since it uses less digits than its factorization.

20315321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109 (or 2107 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 20315321220 its reverse (2212351302), we get a palindrome (22527672522).

The spelling of 20315321220 in words is "twenty billion, three hundred fifteen million, three hundred twenty-one thousand, two hundred twenty".