22403220 has 96 divisors (see below), whose sum is σ = 73495296. Its totient is φ = 4992000.

The previous prime is 22403207. The next prime is 22403231. The reversal of 22403220 is 2230422.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22403220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16570 + ... + 17870.

It is an arithmetic number, because the mean of its divisors is an integer number (765576).

Almost surely, 2^22403220 is an apocalyptic number.

22403220 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 22403220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36747648).

22403220 is an abundant number, since it is smaller than the sum of its proper divisors (51092076).

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

22403220 is a wasteful number, since it uses less digits than its factorization.

22403220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361 (or 1359 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 22403220 is about 4733.2039888431. The cubic root of 22403220 is about 281.9054559580.

Adding to 22403220 its reverse (2230422), we get a palindrome (24633642).

It can be divided in two parts, 2240 and 3220, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 22403220 in words is "twenty-two million, four hundred three thousand, two hundred twenty".