20211220220 has 12 divisors (see below), whose sum is σ = 42443562504. Its totient is φ = 8084488080.

The previous prime is 20211220213. The next prime is 20211220247. The reversal of 20211220220 is 2202211202.

It is a junction number, because it is equal to n+sod(n) for n = 20211220195 and 20211220204.

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, 505280486 + ... + 505280525.

It is an arithmetic number, because the mean of its divisors is an integer number (3536963542).

Almost surely, 2^20211220220 is an apocalyptic number.

20211220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20211220220 is an abundant number, since it is smaller than the sum of its proper divisors (22232342284).

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

20211220220 is a wasteful number, since it uses less digits than its factorization.

20211220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010561020 (or 1010561018 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20211220220 its reverse (2202211202), we get a palindrome (22413431422).

The spelling of 20211220220 in words is "twenty billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty".