20320634736 has 30 divisors (see below), whose sum is σ = 56869554560. Its totient is φ = 6773544864.

The previous prime is 20320634731. The next prime is 20320634749. The reversal of 20320634736 is 63743602302.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20320634736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320634731) 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 5 ways as a sum of consecutive naturals, for example, 70557616 + ... + 70557903.

Almost surely, 2^20320634736 is an apocalyptic number.

It is an amenable number.

20320634736 is an abundant number, since it is smaller than the sum of its proper divisors (36548919824).

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

20320634736 is a wasteful number, since it uses less digits than its factorization.

20320634736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141115533 (or 141115524 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 36.

The spelling of 20320634736 in words is "twenty billion, three hundred twenty million, six hundred thirty-four thousand, seven hundred thirty-six".