20505263513312 has 12 divisors (see below), whose sum is σ = 40369737541896. Its totient is φ = 10252631756640.

The previous prime is 20505263513201. The next prime is 20505263513321. The reversal of 20505263513312 is 21331536250502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320394742364 + ... + 320394742427.

It is an arithmetic number, because the mean of its divisors is an integer number (3364144795158).

Almost surely, 2^{20505263513312} is an apocalyptic number.

It is an amenable number.

20505263513312 is a deficient number, since it is larger than the sum of its proper divisors (19864474028584).

20505263513312 is an equidigital number, since it uses as much as digits as its factorization.

20505263513312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640789484801 (or 640789484793 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

Adding to 20505263513312 its reverse (21331536250502), we get a palindrome (41836799763814).

The spelling of 20505263513312 in words is "twenty trillion, five hundred five billion, two hundred sixty-three million, five hundred thirteen thousand, three hundred twelve".