Search a number
20857680607 is a prime number
BaseRepresentation
bin10011011011001101…
…101111001011011111
31222211121101221212011
4103123031233023133
5320204031234412
613325404252051
71335605234311
oct233315571337
958747357764
1020857680607
118933687175
124061241027
131c752a4b5a
14101c1877b1
158211d87a7
hex4db36f2df

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".