20003221220 has 12 divisors (see below), whose sum is σ = 42006764604. Its totient is φ = 8001288480.

The previous prime is 20003221201. The next prime is 20003221283. The reversal of 20003221220 is 2212230002.

It can be written as a sum of positive squares in 2 ways, for example, as 6506358244 + 13496862976 = 80662^2 + 116176^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20003221195 and 20003221204.

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, 500080511 + ... + 500080550.

It is an arithmetic number, because the mean of its divisors is an integer number (3500563717).

Almost surely, 2^20003221220 is an apocalyptic number.

20003221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20003221220 is an abundant number, since it is smaller than the sum of its proper divisors (22003543384).

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

20003221220 is a wasteful number, since it uses less digits than its factorization.

20003221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000161070 (or 1000161068 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 20003221220 its reverse (2212230002), we get a palindrome (22215451222).

The spelling of 20003221220 in words is "twenty billion, three million, two hundred twenty-one thousand, two hundred twenty".