20320300345 has 24 divisors (see below), whose sum is σ = 25939865304. Its totient is φ = 15228346368.

The previous prime is 20320300339. The next prime is 20320300361. The reversal of 20320300345 is 54300302302.

It can be written as a sum of positive squares in 12 ways, for example, as 16786830096 + 3533470249 = 129564^2 + 59443^2 .

It is not a de Polignac number, because 20320300345 - 2²⁷ = 20186082617 is a prime.

It is a super-2 number, since 2×20320300345² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21872841 + ... + 21873769.

It is an arithmetic number, because the mean of its divisors is an integer number (1080827721).

Almost surely, 2^20320300345 is an apocalyptic number.

It is an amenable number.

20320300345 is a deficient number, since it is larger than the sum of its proper divisors (5619564959).

20320300345 is an frugal number, since it uses more digits than its factorization.

20320300345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 22.

Adding to 20320300345 its reverse (54300302302), we get a palindrome (74620602647).

The spelling of 20320300345 in words is "twenty billion, three hundred twenty million, three hundred thousand, three hundred forty-five".