1851000020 has 48 divisors (see below), whose sum is σ = 3943779840. Its totient is φ = 729640704.

The previous prime is 1850999993. The next prime is 1851000061. The reversal of 1851000020 is 200001581.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1353377 + ... + 1354743.

It is an arithmetic number, because the mean of its divisors is an integer number (82162080).

Almost surely, 2^1851000020 is an apocalyptic number.

1851000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1851000020 is an abundant number, since it is smaller than the sum of its proper divisors (2092779820).

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

1851000020 is a wasteful number, since it uses less digits than its factorization.

1851000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 2310 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1851000020 is about 43023.2497610304. The cubic root of 1851000020 is about 1227.8221801465.

The spelling of 1851000020 in words is "one billion, eight hundred fifty-one million, twenty", and thus it is an aban number.