20201311220 has 12 divisors (see below), whose sum is σ = 42422753604. Its totient is φ = 8080524480.

The previous prime is 20201311211. The next prime is 20201311237. The reversal of 20201311220 is 2211310202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10968791824 + 9232519396 = 104732^2 + 96086^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20201311195 and 20201311204.

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, 505032761 + ... + 505032800.

It is an arithmetic number, because the mean of its divisors is an integer number (3535229467).

Almost surely, 2^20201311220 is an apocalyptic number.

20201311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201311220 is an abundant number, since it is smaller than the sum of its proper divisors (22221442384).

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

20201311220 is a wasteful number, since it uses less digits than its factorization.

20201311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010065570 (or 1010065568 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20201311220 its reverse (2211310202), we get a palindrome (22412621422).

The spelling of 20201311220 in words is "twenty billion, two hundred one million, three hundred eleven thousand, two hundred twenty".