20389092779820 has 96 divisors (see below), whose sum is σ = 58078452116160. Its totient is φ = 5343064796160.

The previous prime is 20389092779761. The next prime is 20389092779851. The reversal of 20389092779820 is 2897729098302.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1451986 + ... + 6548774.

It is an arithmetic number, because the mean of its divisors is an integer number (604983876210).

Almost surely, 2^{20389092779820} is an apocalyptic number.

20389092779820 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 20389092779820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29039226058080).

20389092779820 is an abundant number, since it is smaller than the sum of its proper divisors (37689359336340).

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

20389092779820 is a wasteful number, since it uses less digits than its factorization.

20389092779820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5097955 (or 5097953 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 66.

The spelling of 20389092779820 in words is "twenty trillion, three hundred eighty-nine billion, ninety-two million, seven hundred seventy-nine thousand, eight hundred twenty".