21838220020 has 12 divisors (see below), whose sum is σ = 45860262084. Its totient is φ = 8735288000.

The previous prime is 21838219999. The next prime is 21838220039. The reversal of 21838220020 is 2002283812.

It can be written as a sum of positive squares in 2 ways, for example, as 9760649616 + 12077570404 = 98796^2 + 109898^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 545955481 + ... + 545955520.

It is an arithmetic number, because the mean of its divisors is an integer number (3821688507).

Almost surely, 2^21838220020 is an apocalyptic number.

21838220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21838220020 is an abundant number, since it is smaller than the sum of its proper divisors (24022042064).

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

21838220020 is a wasteful number, since it uses less digits than its factorization.

21838220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091911010 (or 1091911008 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The spelling of 21838220020 in words is "twenty-one billion, eight hundred thirty-eight million, two hundred twenty thousand, twenty".