18057820 has 48 divisors (see below), whose sum is σ = 41932800. Its totient is φ = 6477120.

The previous prime is 18057817. The next prime is 18057839. The reversal of 18057820 is 2875081.

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 15 ways as a sum of consecutive naturals, for example, 16861 + ... + 17899.

It is an arithmetic number, because the mean of its divisors is an integer number (873600).

Almost surely, 2^18057820 is an apocalyptic number.

18057820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18057820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20966400).

18057820 is an abundant number, since it is smaller than the sum of its proper divisors (23874980).

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

18057820 is a wasteful number, since it uses less digits than its factorization.

18057820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 18057820 is about 4249.4493760957. The cubic root of 18057820 is about 262.3544529499.

The spelling of 18057820 in words is "eighteen million, fifty-seven thousand, eight hundred twenty".