20330857 has 2 divisors, whose sum is σ = 20330858. Its totient is φ = 20330856.

The previous prime is 20330851. The next prime is 20330867. The reversal of 20330857 is 75803302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 430336 = 4461^2 + 656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330857 is a prime.

It is not a weakly prime, because it can be changed into another prime (20330851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165428 + 10165429.

It is an arithmetic number, because the mean of its divisors is an integer number (10165429).

Almost surely, 2^20330857 is an apocalyptic number.

It is an amenable number.

20330857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330857 is an equidigital number, since it uses as much as digits as its factorization.

20330857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20330857 is about 4508.9751607211. The cubic root of 20330857 is about 272.9303896550.

The spelling of 20330857 in words is "twenty million, three hundred thirty thousand, eight hundred fifty-seven".