20720013678 has 576 divisors, whose sum is σ = 64247758848. Its totient is φ = 4938071040.

The previous prime is 20720013659. The next prime is 20720013679. The reversal of 20720013678 is 87631002702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720013679) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 163149651 + ... + 163149777.

It is an arithmetic number, because the mean of its divisors is an integer number (111541248).

Almost surely, 2^20720013678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20720013678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32123879424).

20720013678 is an abundant number, since it is smaller than the sum of its proper divisors (43527745170).

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

20720013678 is a wasteful number, since it uses less digits than its factorization.

20720013678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 20720013678 in words is "twenty billion, seven hundred twenty million, thirteen thousand, six hundred seventy-eight".