20201220220 has 12 divisors (see below), whose sum is σ = 42422562504. Its totient is φ = 8080488080.

The previous prime is 20201220209. The next prime is 20201220239. The reversal of 20201220220 is 2202210202.

It is a self number, because there is not a number n which added to its sum of digits gives 20201220220.

It is a congruent number.

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, 505030486 + ... + 505030525.

It is an arithmetic number, because the mean of its divisors is an integer number (3535213542).

Almost surely, 2^20201220220 is an apocalyptic number.

20201220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201220220 is an abundant number, since it is smaller than the sum of its proper divisors (22221342284).

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

20201220220 is a wasteful number, since it uses less digits than its factorization.

20201220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010061020 (or 1010061018 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20201220220 its reverse (2202210202), we get a palindrome (22403430422).

The spelling of 20201220220 in words is "twenty billion, two hundred one million, two hundred twenty thousand, two hundred twenty".