18220252 has 12 divisors (see below), whose sum is σ = 31915800. Its totient is φ = 9101456.

The previous prime is 18220247. The next prime is 18220271. The reversal of 18220252 is 25202281.

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, 5874 + ... + 8422.

It is an arithmetic number, because the mean of its divisors is an integer number (2659650).

Almost surely, 2^18220252 is an apocalyptic number.

It is an amenable number.

18220252 is a deficient number, since it is larger than the sum of its proper divisors (13695548).

18220252 is a wasteful number, since it uses less digits than its factorization.

18220252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4340 (or 4338 counting only the distinct ones).

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

The square root of 18220252 is about 4268.5187126215. The cubic root of 18220252 is about 263.1387413906.

The spelling of 18220252 in words is "eighteen million, two hundred twenty thousand, two hundred fifty-two".