18825220 has 24 divisors (see below), whose sum is σ = 39745944. Its totient is φ = 7489536.

The previous prime is 18825217. The next prime is 18825221. The reversal of 18825220 is 2252881.

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 18731584 = 306^2 + 4328^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18825221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1422 + ... + 6298.

It is an arithmetic number, because the mean of its divisors is an integer number (1656081).

Almost surely, 2^18825220 is an apocalyptic number.

18825220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18825220 is an abundant number, since it is smaller than the sum of its proper divisors (20920724).

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

18825220 is a wasteful number, since it uses less digits than its factorization.

18825220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5079 (or 5077 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18825220 is about 4338.8039826662. The cubic root of 18825220 is about 266.0194268511.

The spelling of 18825220 in words is "eighteen million, eight hundred twenty-five thousand, two hundred twenty".