20644512027700 has 144 divisors (see below), whose sum is σ = 49747627198080. Its totient is φ = 7373583360000.

The previous prime is 20644512027679. The next prime is 20644512027773. The reversal of 20644512027700 is 772021544602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14084644 + ... + 15481156.

It is an arithmetic number, because the mean of its divisors is an integer number (345469633320).

Almost surely, 2^{20644512027700} is an apocalyptic number.

20644512027700 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 20644512027700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24873813599040).

20644512027700 is an abundant number, since it is smaller than the sum of its proper divisors (29103115170380).

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

20644512027700 is a wasteful number, since it uses less digits than its factorization.

20644512027700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396778 (or 1396771 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 40.

The spelling of 20644512027700 in words is "twenty trillion, six hundred forty-four billion, five hundred twelve million, twenty-seven thousand, seven hundred".