20085397 has 2 divisors, whose sum is σ = 20085398. Its totient is φ = 20085396.

The previous prime is 20085383. The next prime is 20085467. The reversal of 20085397 is 79358002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10407076 + 9678321 = 3226^2 + 3111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20085397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20085097) 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, 10042698 + 10042699.

It is an arithmetic number, because the mean of its divisors is an integer number (10042699).

Almost surely, 2^20085397 is an apocalyptic number.

It is an amenable number.

20085397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085397 is an equidigital number, since it uses as much as digits as its factorization.

20085397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20085397 is about 4481.6734597692. The cubic root of 20085397 is about 271.8275516263.

The spelling of 20085397 in words is "twenty million, eighty-five thousand, three hundred ninety-seven".