22235220 has 108 divisors (see below), whose sum is σ = 78489684. Its totient is φ = 5080320.

The previous prime is 22235219. The next prime is 22235231. The reversal of 22235220 is 2253222.

It can be written as a sum of positive squares in 2 ways, for example, as 2414916 + 19820304 = 1554^2 + 4452^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 22235193 and 22235202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7560 + ... + 10080.

Almost surely, 2^22235220 is an apocalyptic number.

22235220 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 22235220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39244842).

22235220 is an abundant number, since it is smaller than the sum of its proper divisors (56254464).

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

22235220 is a wasteful number, since it uses less digits than its factorization.

22235220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550 (or 2538 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 22235220 is about 4715.4236289012. The cubic root of 22235220 is about 281.1990248356.

Adding to 22235220 its reverse (2253222), we get a palindrome (24488442).

The spelling of 22235220 in words is "twenty-two million, two hundred thirty-five thousand, two hundred twenty".