20884535956 has 6 divisors (see below), whose sum is σ = 36547937930. Its totient is φ = 10442267976.

The previous prime is 20884535951. The next prime is 20884536017. The reversal of 20884535956 is 65953548802.

It can be written as a sum of positive squares in only one way, i.e., 20790756100 + 93779856 = 144190^2 + 9684^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20884535897 and 20884535906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20884535951) by changing a digit.

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 as a sum of consecutive naturals, namely, 2610566991 + ... + 2610566998.

Almost surely, 2^20884535956 is an apocalyptic number.

It is an amenable number.

20884535956 is a deficient number, since it is larger than the sum of its proper divisors (15663401974).

20884535956 is a wasteful number, since it uses less digits than its factorization.

20884535956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221133993 (or 5221133991 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 55.

The spelling of 20884535956 in words is "twenty billion, eight hundred eighty-four million, five hundred thirty-five thousand, nine hundred fifty-six".