20640555624216 has 64 divisors (see below), whose sum is σ = 56292948789120. Its totient is φ = 6254655563520.

The previous prime is 20640555624203. The next prime is 20640555624253. The reversal of 20640555624216 is 61242655504602.

It is a super-2 number, since 2×20640555624216² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 34251771 + ... + 34849173.

It is an arithmetic number, because the mean of its divisors is an integer number (879577324830).

Almost surely, 2^{20640555624216} is an apocalyptic number.

It is an amenable number.

20640555624216 is an abundant number, since it is smaller than the sum of its proper divisors (35652393164904).

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

20640555624216 is a wasteful number, since it uses less digits than its factorization.

20640555624216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728296 (or 728292 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 20640555624216 in words is "twenty trillion, six hundred forty billion, five hundred fifty-five million, six hundred twenty-four thousand, two hundred sixteen".