201836381820 has 48 divisors (see below), whose sum is σ = 567609776160. Its totient is φ = 53587996416.

The previous prime is 201836381633. The next prime is 201836381827. The reversal of 201836381820 is 28183638102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201836381827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7331107 + ... + 7358586.

It is an arithmetic number, because the mean of its divisors is an integer number (11825203670).

Almost surely, 2^201836381820 is an apocalyptic number.

201836381820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201836381820 is an abundant number, since it is smaller than the sum of its proper divisors (365773394340).

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

201836381820 is a wasteful number, since it uses less digits than its factorization.

201836381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14689934 (or 14689932 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 201836381820 in words is "two hundred one billion, eight hundred thirty-six million, three hundred eighty-one thousand, eight hundred twenty".