20656751936 has 28 divisors (see below), whose sum is σ = 41100684372. Its totient is φ = 10300674048.

The previous prime is 20656751893. The next prime is 20656751957. The reversal of 20656751936 is 63915765602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5889641536 + 14767110400 = 76744^2 + 121520^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408785 + ... + 456528.

Almost surely, 2^20656751936 is an apocalyptic number.

It is an amenable number.

20656751936 is a deficient number, since it is larger than the sum of its proper divisors (20443932436).

20656751936 is an equidigital number, since it uses as much as digits as its factorization.

20656751936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865698 (or 865688 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 20656751936 in words is "twenty billion, six hundred fifty-six million, seven hundred fifty-one thousand, nine hundred thirty-six".