20857680607 has 2 divisors, whose sum is σ = 20857680608.
Its totient is φ = 20857680606.
The previous prime is 20857680583. The next prime is 20857680611. The reversal of 20857680607 is 70608675802.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 20857680607 - 223 = 20849291999 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (20854680607) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10428840303 + 10428840304.
It is an arithmetic number, because the mean of its divisors is an integer number (10428840304).
Almost surely, 220857680607 is an apocalyptic number.
20857680607 is a deficient number, since it is larger than the sum of its proper divisors (1).
20857680607 is an equidigital number, since it uses as much as digits as its factorization.
20857680607 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1128960, while the sum is 49.
The spelling of 20857680607 in words is "twenty billion, eight hundred fifty-seven million, six hundred eighty thousand, six hundred seven".