22353240 has 256 divisors, whose sum is σ = 87091200. Its totient is φ = 4460544.

The previous prime is 22353223. The next prime is 22353251. The reversal of 22353240 is 4235322.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 251116 + ... + 251204.

It is an arithmetic number, because the mean of its divisors is an integer number (340200).

Almost surely, 2^22353240 is an apocalyptic number.

22353240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

22353240 is the 2730-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22353240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43545600).

22353240 is an abundant number, since it is smaller than the sum of its proper divisors (64737960).

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

22353240 is a wasteful number, since it uses less digits than its factorization.

22353240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 22353240 is about 4727.9213191423. The cubic root of 22353240 is about 281.6956628218.

Adding to 22353240 its reverse (4235322), we get a palindrome (26588562).

The spelling of 22353240 in words is "twenty-two million, three hundred fifty-three thousand, two hundred forty".