22208240 has 20 divisors (see below), whose sum is σ = 51634344. Its totient is φ = 8883264.

The previous prime is 22208213. The next prime is 22208267. The reversal of 22208240 is 4280222.

It is an interprime number because it is at equal distance from previous prime (22208213) and next prime (22208267).

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138722 + ... + 138881.

Almost surely, 2^22208240 is an apocalyptic number.

22208240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22208240 is an abundant number, since it is smaller than the sum of its proper divisors (29426104).

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

22208240 is a wasteful number, since it uses less digits than its factorization.

22208240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277616 (or 277610 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 22208240 is about 4712.5619359325. The cubic root of 22208240 is about 281.0852440812.

Adding to 22208240 its reverse (4280222), we get a palindrome (26488462).

The spelling of 22208240 in words is "twenty-two million, two hundred eight thousand, two hundred forty".