2018581820 has 12 divisors (see below), whose sum is σ = 4239021864. Its totient is φ = 807432720.

The previous prime is 2018581787. The next prime is 2018581843. The reversal of 2018581820 is 281858102.

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, 50464526 + ... + 50464565.

It is an arithmetic number, because the mean of its divisors is an integer number (353251822).

Almost surely, 2^2018581820 is an apocalyptic number.

2018581820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2018581820 is an abundant number, since it is smaller than the sum of its proper divisors (2220440044).

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

2018581820 is a wasteful number, since it uses less digits than its factorization.

2018581820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100929100 (or 100929098 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 2018581820 is about 44928.6302929435. The cubic root of 2018581820 is about 1263.8109653950.

The spelling of 2018581820 in words is "two billion, eighteen million, five hundred eighty-one thousand, eight hundred twenty".