20183821820 has 48 divisors (see below), whose sum is σ = 42832939968. Its totient is φ = 7988505600.

The previous prime is 20183821811. The next prime is 20183821841. The reversal of 20183821820 is 2812838102.

It is a super-2 number, since 2×20183821820² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5720897 + ... + 5724423.

It is an arithmetic number, because the mean of its divisors is an integer number (892352916).

Almost surely, 2^20183821820 is an apocalyptic number.

20183821820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20183821820 is an abundant number, since it is smaller than the sum of its proper divisors (22649118148).

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

20183821820 is a wasteful number, since it uses less digits than its factorization.

20183821820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6470 (or 6468 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

It can be divided in two parts, 2018382 and 1820, that added together give a palindrome (2020202).

The spelling of 20183821820 in words is "twenty billion, one hundred eighty-three million, eight hundred twenty-one thousand, eight hundred twenty".