1320420005 has 32 divisors (see below), whose sum is σ = 1725688800. Its totient is φ = 966131712.

The previous prime is 1320419993. The next prime is 1320420007. The reversal of 1320420005 is 5000240231.

It can be written as a sum of positive squares in 16 ways, for example, as 197767969 + 1122652036 = 14063^2 + 33506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320420005 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320420007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 489701 + ... + 492389.

It is an arithmetic number, because the mean of its divisors is an integer number (53927775).

Almost surely, 2^1320420005 is an apocalyptic number.

It is an amenable number.

1320420005 is a deficient number, since it is larger than the sum of its proper divisors (405268795).

1320420005 is a wasteful number, since it uses less digits than its factorization.

1320420005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1320420005 is about 36337.5839180318. The cubic root of 1320420005 is about 1097.0776439153.

Adding to 1320420005 its reverse (5000240231), we get a palindrome (6320660236).

The spelling of 1320420005 in words is "one billion, three hundred twenty million, four hundred twenty thousand, five".