20185463421664 has 48 divisors (see below), whose sum is σ = 42436625051520. Its totient is φ = 9430361095680.

The previous prime is 20185463421647. The next prime is 20185463421671. The reversal of 20185463421664 is 46612436458102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350803119 + ... + 350860654.

It is an arithmetic number, because the mean of its divisors is an integer number (884096355240).

Almost surely, 2^{20185463421664} is an apocalyptic number.

It is an amenable number.

20185463421664 is an abundant number, since it is smaller than the sum of its proper divisors (22251161629856).

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

20185463421664 is a wasteful number, since it uses less digits than its factorization.

20185463421664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701663843 (or 701663835 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 52.

Adding to 20185463421664 its reverse (46612436458102), we get a palindrome (66797899879766).

The spelling of 20185463421664 in words is "twenty trillion, one hundred eighty-five billion, four hundred sixty-three million, four hundred twenty-one thousand, six hundred sixty-four".