20815456418528 has 12 divisors (see below), whose sum is σ = 40980429824040. Its totient is φ = 10407728209248.

The previous prime is 20815456418527. The next prime is 20815456418579. The reversal of 20815456418528 is 82581465451802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20815456418527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325241506508 + ... + 325241506571.

It is an arithmetic number, because the mean of its divisors is an integer number (3415035818670).

Almost surely, 2^{20815456418528} is an apocalyptic number.

It is an amenable number.

20815456418528 is a deficient number, since it is larger than the sum of its proper divisors (20164973405512).

20815456418528 is an equidigital number, since it uses as much as digits as its factorization.

20815456418528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650483013089 (or 650483013081 counting only the distinct ones).

The product of its (nonzero) digits is 24576000, while the sum is 59.

The spelling of 20815456418528 in words is "twenty trillion, eight hundred fifteen billion, four hundred fifty-six million, four hundred eighteen thousand, five hundred twenty-eight".