1820222220404 has 24 divisors (see below), whose sum is σ = 3640491106560. Its totient is φ = 780085237536.

The previous prime is 1820222220361. The next prime is 1820222220407. The reversal of 1820222220404 is 4040222220281.

It is a super-3 number, since 3×1820222220404³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820222220407) 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 7 ways as a sum of consecutive naturals, for example, 2066234 + ... + 2812430.

It is an arithmetic number, because the mean of its divisors is an integer number (151687129440).

Almost surely, 2^{1820222220404} is an apocalyptic number.

1820222220404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1820222220404 is an abundant number, since it is smaller than the sum of its proper divisors (1820268886156).

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

1820222220404 is a wasteful number, since it uses less digits than its factorization.

1820222220404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833327 (or 833325 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 1820222220404 its reverse (4040222220281), we get a palindrome (5860444440685).

The spelling of 1820222220404 in words is "one trillion, eight hundred twenty billion, two hundred twenty-two million, two hundred twenty thousand, four hundred four".