18250420 has 12 divisors (see below), whose sum is σ = 38325924. Its totient is φ = 7300160.

The previous prime is 18250403. The next prime is 18250423. The reversal of 18250420 is 2405281.

It can be written as a sum of positive squares in 2 ways, for example, as 5817744 + 12432676 = 2412^2 + 3526^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18250391 and 18250400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18250423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456241 + ... + 456280.

It is an arithmetic number, because the mean of its divisors is an integer number (3193827).

Almost surely, 2^18250420 is an apocalyptic number.

18250420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18250420 is an abundant number, since it is smaller than the sum of its proper divisors (20075504).

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

18250420 is a wasteful number, since it uses less digits than its factorization.

18250420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912530 (or 912528 counting only the distinct ones).

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

The square root of 18250420 is about 4272.0510296578. The cubic root of 18250420 is about 263.2838910896.

The spelling of 18250420 in words is "eighteen million, two hundred fifty thousand, four hundred twenty".