1820220013 has 2 divisors, whose sum is σ = 1820220014. Its totient is φ = 1820220012.

The previous prime is 1820220001. The next prime is 1820220037. The reversal of 1820220013 is 3100220281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1777212649 + 43007364 = 42157^2 + 6558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820220013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820220043) by changing a digit.

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 as a sum of consecutive naturals, namely, 910110006 + 910110007.

It is an arithmetic number, because the mean of its divisors is an integer number (910110007).

Almost surely, 2^1820220013 is an apocalyptic number.

It is an amenable number.

1820220013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820220013 is an equidigital number, since it uses as much as digits as its factorization.

1820220013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1820220013 is about 42664.0365296112. The cubic root of 1820220013 is about 1220.9783456189.

Adding to 1820220013 its reverse (3100220281), we get a palindrome (4920440294).

The spelling of 1820220013 in words is "one billion, eight hundred twenty million, two hundred twenty thousand, thirteen".