20465112545 has 4 divisors (see below), whose sum is σ = 24558135060. Its totient is φ = 16372090032.

The previous prime is 20465112527. The next prime is 20465112557. The reversal of 20465112545 is 54521156402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11365478881 + 9099633664 = 106609^2 + 95392^2 .

It is a cyclic number.

It is not a de Polignac number, because 20465112545 - 2⁸ = 20465112289 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046511250 + ... + 2046511259.

It is an arithmetic number, because the mean of its divisors is an integer number (6139533765).

Almost surely, 2^20465112545 is an apocalyptic number.

It is an amenable number.

20465112545 is a deficient number, since it is larger than the sum of its proper divisors (4093022515).

20465112545 is an equidigital number, since it uses as much as digits as its factorization.

20465112545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093022514.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 20465112545 its reverse (54521156402), we get a palindrome (74986268947).

The spelling of 20465112545 in words is "twenty billion, four hundred sixty-five million, one hundred twelve thousand, five hundred forty-five".