20201223220 has 24 divisors (see below), whose sum is σ = 43325178624. Its totient is φ = 7908563616.

The previous prime is 20201223169. The next prime is 20201223221. The reversal of 20201223220 is 2232210202.

It is a junction number, because it is equal to n+sod(n) for n = 20201223194 and 20201223203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201223221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10744392 + ... + 10746271.

It is an arithmetic number, because the mean of its divisors is an integer number (1805215776).

Almost surely, 2^20201223220 is an apocalyptic number.

20201223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201223220 is an abundant number, since it is smaller than the sum of its proper divisors (23123955404).

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

20201223220 is a wasteful number, since it uses less digits than its factorization.

20201223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21490719 (or 21490717 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20201223220 its reverse (2232210202), we get a palindrome (22433433422).

The spelling of 20201223220 in words is "twenty billion, two hundred one million, two hundred twenty-three thousand, two hundred twenty".