1820220004 has 12 divisors (see below), whose sum is σ = 3189006828. Its totient is φ = 909075200.

The previous prime is 1820220001. The next prime is 1820220013. The reversal of 1820220004 is 4000220281.

It can be written as a sum of positive squares in 2 ways, for example, as 595360000 + 1224860004 = 24400^2 + 34998^2 .

It is not an unprimeable number, because it can be changed into a prime (1820220001) by changing a digit.

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, 254737 + ... + 261784.

It is an arithmetic number, because the mean of its divisors is an integer number (265750569).

Almost surely, 2^1820220004 is an apocalyptic number.

It is an amenable number.

1820220004 is a deficient number, since it is larger than the sum of its proper divisors (1368786824).

1820220004 is a wasteful number, since it uses less digits than its factorization.

1820220004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517406 (or 517404 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1820220004 is about 42664.0364241360. The cubic root of 1820220004 is about 1220.9783436065.

Adding to 1820220004 its reverse (4000220281), we get a palindrome (5820440285).

The spelling of 1820220004 in words is "one billion, eight hundred twenty million, two hundred twenty thousand, four".