20566714920 has 256 divisors, whose sum is σ = 70631481600. Its totient is φ = 4757667840.

The previous prime is 20566714907. The next prime is 20566714967. The reversal of 20566714920 is 2941766502.

It is a Cunningham number, because it is equal to 143411²-1.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1426950 + ... + 1441290.

It is an arithmetic number, because the mean of its divisors is an integer number (275904225).

Almost surely, 2^20566714920 is an apocalyptic number.

20566714920 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 20566714920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35315740800).

20566714920 is an abundant number, since it is smaller than the sum of its proper divisors (50064766680).

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

20566714920 is a wasteful number, since it uses less digits than its factorization.

20566714920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14428 (or 14424 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 20566714920 in words is "twenty billion, five hundred sixty-six million, seven hundred fourteen thousand, nine hundred twenty".