18222520 has 32 divisors (see below), whose sum is σ = 43160400. Its totient is φ = 6905088.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222520 is 2522281.

It is a junction number, because it is equal to n+sod(n) for n = 18222491 and 18222500.

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 7 ways as a sum of consecutive naturals, for example, 11229 + ... + 12748.

Almost surely, 2^18222520 is an apocalyptic number.

18222520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18222520 is an abundant number, since it is smaller than the sum of its proper divisors (24937880).

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

18222520 is a wasteful number, since it uses less digits than its factorization.

18222520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24007 (or 24003 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 18222520 is about 4268.7843702862. The cubic root of 18222520 is about 263.1496591668.

The spelling of 18222520 in words is "eighteen million, two hundred twenty-two thousand, five hundred twenty".