20909318936 has 32 divisors (see below), whose sum is σ = 43924988880. Its totient is φ = 9247363200.

The previous prime is 20909318923. The next prime is 20909318939. The reversal of 20909318936 is 63981390902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20909318939) 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 in 7 ways as a sum of consecutive naturals, for example, 3207635 + ... + 3214146.

Almost surely, 2^20909318936 is an apocalyptic number.

It is an amenable number.

20909318936 is an abundant number, since it is smaller than the sum of its proper divisors (23015669944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20909318936 is a wasteful number, since it uses less digits than its factorization.

20909318936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6421835 (or 6421831 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 20909318936 in words is "twenty billion, nine hundred nine million, three hundred eighteen thousand, nine hundred thirty-six".