20507385616 has 15 divisors (see below), whose sum is σ = 39734169493. Its totient is φ = 10253406400.

The previous prime is 20507385599. The next prime is 20507385623. The reversal of 20507385616 is 61658370502.

The square root of 20507385616 is 143204.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3794067216 + 16713318400 = 61596^2 + 129280^2 .

It is a Duffinian number.

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 2 ways as a sum of consecutive naturals, for example, 554916 + ... + 590716.

Almost surely, 2^20507385616 is an apocalyptic number.

20507385616 is the 143204-th square number.

It is an amenable number.

20507385616 is a deficient number, since it is larger than the sum of its proper divisors (19226783877).

20507385616 is an frugal number, since it uses more digits than its factorization.

20507385616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71610 (or 35803 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 20507385616 in words is "twenty billion, five hundred seven million, three hundred eighty-five thousand, six hundred sixteen".