20635773856 has 24 divisors (see below), whose sum is σ = 40630679460. Its totient is φ = 10316871168.

The previous prime is 20635773827. The next prime is 20635773863. The reversal of 20635773856 is 65837753602.

It can be written as a sum of positive squares in 2 ways, for example, as 16774394256 + 3861379600 = 129516^2 + 62140^2 .

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, 380910 + ... + 431698.

Almost surely, 2^20635773856 is an apocalyptic number.

It is an amenable number.

20635773856 is a deficient number, since it is larger than the sum of its proper divisors (19994905604).

20635773856 is a wasteful number, since it uses less digits than its factorization.

20635773856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63496 (or 63488 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 20635773856 in words is "twenty billion, six hundred thirty-five million, seven hundred seventy-three thousand, eight hundred fifty-six".