20836603856 has 10 divisors (see below), whose sum is σ = 40370920002. Its totient is φ = 10418301920.

The previous prime is 20836603813. The next prime is 20836603867. The reversal of 20836603856 is 65830663802.

It can be written as a sum of positive squares in only one way, i.e., 19768360000 + 1068243856 = 140600^2 + 32684^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20836603856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651143855 + ... + 651143886.

Almost surely, 2^20836603856 is an apocalyptic number.

It is an amenable number.

20836603856 is a deficient number, since it is larger than the sum of its proper divisors (19534316146).

20836603856 is a wasteful number, since it uses less digits than its factorization.

20836603856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302287749 (or 1302287743 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 20836603856 in words is "twenty billion, eight hundred thirty-six million, six hundred three thousand, eight hundred fifty-six".