20531344020345 has 12 divisors (see below), whose sum is σ = 35587662968676. Its totient is φ = 10950050144160.

The previous prime is 20531344020287. The next prime is 20531344020349. The reversal of 20531344020345 is 54302044313502.

20531344020345 is a `hidden beast` number, since 2 + 0 + 5 + 3 + 1 + 3 + 440 + 203 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11367470778624 + 9163873241721 = 3371568^2 + 3027189^2 .

It is not a de Polignac number, because 20531344020345 - 2⁹ = 20531344019833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20531344020349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228126044626 + ... + 228126044715.

It is an arithmetic number, because the mean of its divisors is an integer number (2965638580723).

Almost surely, 2^{20531344020345} is an apocalyptic number.

It is an amenable number.

20531344020345 is a deficient number, since it is larger than the sum of its proper divisors (15056318948331).

20531344020345 is a wasteful number, since it uses less digits than its factorization.

20531344020345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456252089352 (or 456252089349 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 20531344020345 its reverse (54302044313502), we get a palindrome (74833388333847).

The spelling of 20531344020345 in words is "twenty trillion, five hundred thirty-one billion, three hundred forty-four million, twenty thousand, three hundred forty-five".