1822811220 has 36 divisors (see below), whose sum is σ = 5529194580. Its totient is φ = 486082944.

The previous prime is 1822811219. The next prime is 1822811239. The reversal of 1822811220 is 221182281.

It can be written as a sum of positive squares in 2 ways, for example, as 695060496 + 1127750724 = 26364^2 + 33582^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5063185 + ... + 5063544.

Almost surely, 2^1822811220 is an apocalyptic number.

1822811220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1822811220 is an abundant number, since it is smaller than the sum of its proper divisors (3706383360).

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

1822811220 is a wasteful number, since it uses less digits than its factorization.

1822811220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126744 (or 10126739 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 1822811220 is about 42694.3933087238. The cubic root of 1822811220 is about 1221.5574528149.

The spelling of 1822811220 in words is "one billion, eight hundred twenty-two million, eight hundred eleven thousand, two hundred twenty".