1803801820 has 24 divisors (see below), whose sum is σ = 3788843184. Its totient is φ = 721357056.

The previous prime is 1803801809. The next prime is 1803801823. The reversal of 1803801820 is 281083081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803801823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121524 + ... + 135556.

It is an arithmetic number, because the mean of its divisors is an integer number (157868466).

Almost surely, 2^1803801820 is an apocalyptic number.

1803801820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1803801820 is an abundant number, since it is smaller than the sum of its proper divisors (1985041364).

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

1803801820 is a wasteful number, since it uses less digits than its factorization.

1803801820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20469 (or 20467 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 1803801820 is about 42471.1881161806. The cubic root of 1803801820 is about 1217.2962204638.

The spelling of 1803801820 in words is "one billion, eight hundred three million, eight hundred one thousand, eight hundred twenty".