20523145064 has 16 divisors (see below), whose sum is σ = 38944523520. Its totient is φ = 10137938800.

The previous prime is 20523145063. The next prime is 20523145073. The reversal of 20523145064 is 46054132502.

It is a self number, because there is not a number n which added to its sum of digits gives 20523145064.

It is not an unprimeable number, because it can be changed into a prime (20523145063) by changing a digit.

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, 15453512 + ... + 15454839.

It is an arithmetic number, because the mean of its divisors is an integer number (2434032720).

Almost surely, 2^20523145064 is an apocalyptic number.

It is an amenable number.

20523145064 is a deficient number, since it is larger than the sum of its proper divisors (18421378456).

20523145064 is a wasteful number, since it uses less digits than its factorization.

20523145064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30908440 (or 30908436 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 20523145064 its reverse (46054132502), we get a palindrome (66577277566).

The spelling of 20523145064 in words is "twenty billion, five hundred twenty-three million, one hundred forty-five thousand, sixty-four".