20693957536 has 72 divisors (see below), whose sum is σ = 47420160480. Its totient is φ = 8863731072.

The previous prime is 20693957519. The next prime is 20693957551. The reversal of 20693957536 is 63575939602.

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 in 11 ways as a sum of consecutive naturals, for example, 4204485 + ... + 4209403.

It is an arithmetic number, because the mean of its divisors is an integer number (658613340).

Almost surely, 2^20693957536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20693957536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23710080240).

20693957536 is an abundant number, since it is smaller than the sum of its proper divisors (26726202944).

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

20693957536 is a wasteful number, since it uses less digits than its factorization.

20693957536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7626 (or 7611 counting only the distinct ones).

The product of its (nonzero) digits is 9185400, while the sum is 55.

The spelling of 20693957536 in words is "twenty billion, six hundred ninety-three million, nine hundred fifty-seven thousand, five hundred thirty-six".