20731637936 has 10 divisors (see below), whose sum is σ = 40167548532. Its totient is φ = 10365818960.

The previous prime is 20731637929. The next prime is 20731637947. The reversal of 20731637936 is 63973613702.

It is an unprimeable number.

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, 647863670 + ... + 647863701.

Almost surely, 2^20731637936 is an apocalyptic number.

It is an amenable number.

20731637936 is a deficient number, since it is larger than the sum of its proper divisors (19435910596).

20731637936 is a wasteful number, since it uses less digits than its factorization.

20731637936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295727379 (or 1295727373 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 47.

The spelling of 20731637936 in words is "twenty billion, seven hundred thirty-one million, six hundred thirty-seven thousand, nine hundred thirty-six".