20345023545505 has 8 divisors (see below), whose sum is σ = 24414055388712. Its totient is φ = 16276000747008.

The previous prime is 20345023545493. The next prime is 20345023545527. The reversal of 20345023545505 is 50554532054302.

It can be written as a sum of positive squares in 4 ways, for example, as 6444347799184 + 13900675746321 = 2538572^2 + 3728361^2 .

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 20345023545505 - 2¹³ = 20345023537313 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, 4555839 + ... + 7838731.

It is an arithmetic number, because the mean of its divisors is an integer number (3051756923589).

Almost surely, 2^{20345023545505} is an apocalyptic number.

It is an amenable number.

20345023545505 is a deficient number, since it is larger than the sum of its proper divisors (4069031843207).

20345023545505 is a wasteful number, since it uses less digits than its factorization.

20345023545505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522355.

The product of its (nonzero) digits is 1800000, while the sum is 43.

Adding to 20345023545505 its reverse (50554532054302), we get a palindrome (70899555599807).

The spelling of 20345023545505 in words is "twenty trillion, three hundred forty-five billion, twenty-three million, five hundred forty-five thousand, five hundred five".