20057197 has 2 divisors, whose sum is σ = 20057198. Its totient is φ = 20057196.

The previous prime is 20057189. The next prime is 20057239. The reversal of 20057197 is 79175002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18369796 + 1687401 = 4286^2 + 1299^2 .

It is a cyclic number.

It is not a de Polignac number, because 20057197 - 2³ = 20057189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20057117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10028598 + 10028599.

It is an arithmetic number, because the mean of its divisors is an integer number (10028599).

Almost surely, 2^20057197 is an apocalyptic number.

It is an amenable number.

20057197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057197 is an equidigital number, since it uses as much as digits as its factorization.

20057197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 20057197 is about 4478.5262084753. The cubic root of 20057197 is about 271.7002762856.

The spelling of 20057197 in words is "twenty million, fifty-seven thousand, one hundred ninety-seven".