20651083636 has 12 divisors (see below), whose sum is σ = 36141194628. Its totient is φ = 10325028032.

The previous prime is 20651083601. The next prime is 20651083667. The reversal of 20651083636 is 63638015602.

It can be written as a sum of positive squares in 2 ways, for example, as 14775861136 + 5875222500 = 121556^2 + 76650^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29551 + ... + 205366.

It is an arithmetic number, because the mean of its divisors is an integer number (3011766219).

Almost surely, 2^20651083636 is an apocalyptic number.

It is an amenable number.

20651083636 is a deficient number, since it is larger than the sum of its proper divisors (15490110992).

20651083636 is a wasteful number, since it uses less digits than its factorization.

20651083636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256898 (or 256896 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 20651083636 in words is "twenty billion, six hundred fifty-one million, eighty-three thousand, six hundred thirty-six".