20321144545 has 8 divisors (see below), whose sum is σ = 26261171496. Its totient is φ = 15006383616.

The previous prime is 20321144507. The next prime is 20321144579. The reversal of 20321144545 is 54544112302.

It can be written as a sum of positive squares in 4 ways, for example, as 941998864 + 19379145681 = 30692^2 + 139209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20321144545 - 2¹¹ = 20321142497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156316432 + ... + 156316561.

It is an arithmetic number, because the mean of its divisors is an integer number (3282646437).

Almost surely, 2^20321144545 is an apocalyptic number.

It is an amenable number.

20321144545 is a deficient number, since it is larger than the sum of its proper divisors (5940026951).

20321144545 is a wasteful number, since it uses less digits than its factorization.

20321144545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312633011.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 20321144545 its reverse (54544112302), we get a palindrome (74865256847).

The spelling of 20321144545 in words is "twenty billion, three hundred twenty-one million, one hundred forty-four thousand, five hundred forty-five".