20223220 has 36 divisors (see below), whose sum is σ = 44837604. Its totient is φ = 7660800.

The previous prime is 20223193. The next prime is 20223221. The reversal of 20223220 is 2232202.

It can be written as a sum of positive squares in 2 ways, for example, as 8785296 + 11437924 = 2964^2 + 3382^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20223220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20223221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5820 + ... + 8620.

It is an arithmetic number, because the mean of its divisors is an integer number (1245489).

Almost surely, 2^20223220 is an apocalyptic number.

20223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22418802).

20223220 is an abundant number, since it is smaller than the sum of its proper divisors (24614384).

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

20223220 is a wasteful number, since it uses less digits than its factorization.

20223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848 (or 2827 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20223220 is about 4497.0234600233. The cubic root of 20223220 is about 272.4478816241.

Adding to 20223220 its reverse (2232202), we get a palindrome (22455422).

The spelling of 20223220 in words is "twenty million, two hundred twenty-three thousand, two hundred twenty".