20450516312464 has 80 divisors (see below), whose sum is σ = 48264539371776. Its totient is φ = 8194318848000.

The previous prime is 20450516312417. The next prime is 20450516312477. The reversal of 20450516312464 is 46421361505402.

It is a self number, because there is not a number n which added to its sum of digits gives 20450516312464.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35278117 + ... + 35853124.

Almost surely, 2^{20450516312464} is an apocalyptic number.

It is an amenable number.

20450516312464 is an abundant number, since it is smaller than the sum of its proper divisors (27814023059312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20450516312464 is a wasteful number, since it uses less digits than its factorization.

20450516312464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71131424 (or 71131418 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 43.

Adding to 20450516312464 its reverse (46421361505402), we get a palindrome (66871877817866).

The spelling of 20450516312464 in words is "twenty trillion, four hundred fifty billion, five hundred sixteen million, three hundred twelve thousand, four hundred sixty-four".