20516225514464 has 96 divisors (see below), whose sum is σ = 41560765424640. Its totient is φ = 9962167767552.

The previous prime is 20516225514443. The next prime is 20516225514487. The reversal of 20516225514464 is 46441552261502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1609993277 + ... + 1610006019.

It is an arithmetic number, because the mean of its divisors is an integer number (432924639840).

Almost surely, 2^{20516225514464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20516225514464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20780382712320).

20516225514464 is an abundant number, since it is smaller than the sum of its proper divisors (21044539910176).

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

20516225514464 is a wasteful number, since it uses less digits than its factorization.

20516225514464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15232 (or 15224 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 47.

Adding to 20516225514464 its reverse (46441552261502), we get a palindrome (66957777775966).

The spelling of 20516225514464 in words is "twenty trillion, five hundred sixteen billion, two hundred twenty-five million, five hundred fourteen thousand, four hundred sixty-four".