22143220 has 48 divisors (see below), whose sum is σ = 51057216. Its totient is φ = 8000000.

The previous prime is 22143217. The next prime is 22143223. The reversal of 22143220 is 2234122.

It is an interprime number because it is at equal distance from previous prime (22143217) and next prime (22143223).

It is a junction number, because it is equal to n+sod(n) for n = 22143194 and 22143203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22143223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55020 + ... + 55420.

It is an arithmetic number, because the mean of its divisors is an integer number (1063692).

Almost surely, 2^22143220 is an apocalyptic number.

22143220 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 22143220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25528608).

22143220 is an abundant number, since it is smaller than the sum of its proper divisors (28913996).

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

22143220 is a wasteful number, since it uses less digits than its factorization.

22143220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

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

The square root of 22143220 is about 4705.6582961367. The cubic root of 22143220 is about 280.8106608994.

Adding to 22143220 its reverse (2234122), we get a palindrome (24377342).

The spelling of 22143220 in words is "twenty-two million, one hundred forty-three thousand, two hundred twenty".