20320004015 has 4 divisors (see below), whose sum is σ = 24384004824. Its totient is φ = 16256003208.

The previous prime is 20320003999. The next prime is 20320004021. The reversal of 20320004015 is 51040002302.

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

It is a cyclic number.

It is not a de Polignac number, because 20320004015 - 2⁴ = 20320003999 is a prime.

It is a super-2 number, since 2×20320004015² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320003984 and 20320004002.

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, 2032000397 + ... + 2032000406.

It is an arithmetic number, because the mean of its divisors is an integer number (6096001206).

Almost surely, 2^20320004015 is an apocalyptic number.

20320004015 is a deficient number, since it is larger than the sum of its proper divisors (4064000809).

20320004015 is an equidigital number, since it uses as much as digits as its factorization.

20320004015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064000808.

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

Adding to 20320004015 its reverse (51040002302), we get a palindrome (71360006317).

The spelling of 20320004015 in words is "twenty billion, three hundred twenty million, four thousand, fifteen".