1020320009 has 4 divisors (see below), whose sum is σ = 1020539520. Its totient is φ = 1020100500.

The previous prime is 1020319999. The next prime is 1020320027. The reversal of 1020320009 is 9000230201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020320009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020320209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102629 + ... + 112130.

It is an arithmetic number, because the mean of its divisors is an integer number (255134880).

Almost surely, 2^1020320009 is an apocalyptic number.

It is an amenable number.

1020320009 is a deficient number, since it is larger than the sum of its proper divisors (219511).

1020320009 is an equidigital number, since it uses as much as digits as its factorization.

1020320009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219510.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1020320009 is about 31942.4483876863. The cubic root of 1020320009 is about 1006.7279692480.

The spelling of 1020320009 in words is "one billion, twenty million, three hundred twenty thousand, nine".