20666520000 has 840 divisors, whose sum is σ = 86649763200. Its totient is φ = 4610304000.

The previous prime is 20666519971. The next prime is 20666520013. The reversal of 20666520000 is 2566602.

It is a tau number, because it is divible by the number of its divisors (840).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 148679931 + ... + 148680069.

It is an arithmetic number, because the mean of its divisors is an integer number (103154480).

Almost surely, 2^20666520000 is an apocalyptic number.

20666520000 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 20666520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43324881600).

20666520000 is an abundant number, since it is smaller than the sum of its proper divisors (65983243200).

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

20666520000 is a wasteful number, since it uses less digits than its factorization.

20666520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The spelling of 20666520000 in words is "twenty billion, six hundred sixty-six million, five hundred twenty thousand".