1220005205 has 8 divisors (see below), whose sum is σ = 1514489400. Its totient is φ = 942348736.

The previous prime is 1220005201. The next prime is 1220005223. The reversal of 1220005205 is 5025000221.

It can be written as a sum of positive squares in 4 ways, for example, as 146918641 + 1073086564 = 12121^2 + 32758^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220005205 - 2² = 1220005201 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220005201) 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 7 ways as a sum of consecutive naturals, for example, 4206770 + ... + 4207059.

It is an arithmetic number, because the mean of its divisors is an integer number (189311175).

Almost surely, 2^1220005205 is an apocalyptic number.

It is an amenable number.

1220005205 is a deficient number, since it is larger than the sum of its proper divisors (294484195).

1220005205 is an equidigital number, since it uses as much as digits as its factorization.

1220005205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8413863.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 1220005205 is about 34928.5729024247. The cubic root of 1220005205 is about 1068.5312497361.

Adding to 1220005205 its reverse (5025000221), we get a palindrome (6245005426).

The spelling of 1220005205 in words is "one billion, two hundred twenty million, five thousand, two hundred five".