18200181820 has 24 divisors (see below), whose sum is σ = 38598805728. Its totient is φ = 7207992000.

The previous prime is 18200181803. The next prime is 18200181823. The reversal of 18200181820 is 2818100281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18200181823) 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, 4502976 + ... + 4507015.

It is an arithmetic number, because the mean of its divisors is an integer number (1608283572).

Almost surely, 2^18200181820 is an apocalyptic number.

18200181820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18200181820 is an abundant number, since it is smaller than the sum of its proper divisors (20398623908).

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

18200181820 is a wasteful number, since it uses less digits than its factorization.

18200181820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9010101 (or 9010099 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The spelling of 18200181820 in words is "eighteen billion, two hundred million, one hundred eighty-one thousand, eight hundred twenty".