1020320605 has 4 divisors (see below), whose sum is σ = 1224384732. Its totient is φ = 816256480.

The previous prime is 1020320599. The next prime is 1020320633. The reversal of 1020320605 is 5060230201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 372567204 + 647753401 = 19302^2 + 25451^2 .

It is not a de Polignac number, because 1020320605 - 2³ = 1020320597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102032056 + ... + 102032065.

It is an arithmetic number, because the mean of its divisors is an integer number (306096183).

Almost surely, 2^1020320605 is an apocalyptic number.

It is an amenable number.

1020320605 is a deficient number, since it is larger than the sum of its proper divisors (204064127).

1020320605 is an equidigital number, since it uses as much as digits as its factorization.

1020320605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204064126.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1020320605 is about 31942.4577169635. The cubic root of 1020320605 is about 1006.7281652681.

Adding to 1020320605 its reverse (5060230201), we get a palindrome (6080550806).

The spelling of 1020320605 in words is "one billion, twenty million, three hundred twenty thousand, six hundred five".