20502205720736 has 48 divisors (see below), whose sum is σ = 41608735869960. Its totient is φ = 9936967633920.

The previous prime is 20502205720627. The next prime is 20502205720781. The reversal of 20502205720736 is 63702750220502.

It can be written as a sum of positive squares in 4 ways, for example, as 15584651107600 + 4917554613136 = 3947740^2 + 2217556^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20502205720693 and 20502205720702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31867475 + ... + 32504466.

Almost surely, 2^{20502205720736} is an apocalyptic number.

It is an amenable number.

20502205720736 is an abundant number, since it is smaller than the sum of its proper divisors (21106530149224).

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

20502205720736 is a wasteful number, since it uses less digits than its factorization.

20502205720736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64372257 (or 64372249 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 41.

The spelling of 20502205720736 in words is "twenty trillion, five hundred two billion, two hundred five million, seven hundred twenty thousand, seven hundred thirty-six".