1820220005 has 16 divisors (see below), whose sum is σ = 2316625920. Its totient is φ = 1368221952.

The previous prime is 1820220001. The next prime is 1820220013. The reversal of 1820220005 is 5000220281.

It is a cyclic number.

It is not a de Polignac number, because 1820220005 - 2² = 1820220001 is a prime.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33956 + ... + 69234.

It is an arithmetic number, because the mean of its divisors is an integer number (144789120).

Almost surely, 2^1820220005 is an apocalyptic number.

It is an amenable number.

1820220005 is a deficient number, since it is larger than the sum of its proper divisors (496405915).

1820220005 is a wasteful number, since it uses less digits than its factorization.

1820220005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35908.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1820220005 is about 42664.0364358554. The cubic root of 1820220005 is about 1220.9783438301.

Adding to 1820220005 its reverse (5000220281), we get a palindrome (6820440286).

The spelling of 1820220005 in words is "one billion, eight hundred twenty million, two hundred twenty thousand, five".