20869566720 has 144 divisors (see below), whose sum is σ = 66729993792. Its totient is φ = 5558722560.

The previous prime is 20869566709. The next prime is 20869566733. The reversal of 20869566720 is 2766596802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3917979 + ... + 3923301.

Almost surely, 2^20869566720 is an apocalyptic number.

20869566720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20869566720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33364996896).

20869566720 is an abundant number, since it is smaller than the sum of its proper divisors (45860427072).

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

20869566720 is a wasteful number, since it uses less digits than its factorization.

20869566720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6368 (or 6354 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 20869566720 in words is "twenty billion, eight hundred sixty-nine million, five hundred sixty-six thousand, seven hundred twenty".