20217019 has 2 divisors, whose sum is σ = 20217020. Its totient is φ = 20217018.

The previous prime is 20216981. The next prime is 20217077. The reversal of 20217019 is 91071202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20217019 - 2⁹ = 20216507 is a prime.

It is a super-2 number, since 2×20217019² = 817455714492722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20217319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108509 + 10108510.

It is an arithmetic number, because the mean of its divisors is an integer number (10108510).

Almost surely, 2^20217019 is an apocalyptic number.

20217019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20217019 is an equidigital number, since it uses as much as digits as its factorization.

20217019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20217019 is about 4496.3339511206. Note that the first 3 decimals coincide. The cubic root of 20217019 is about 272.4200320858.

The spelling of 20217019 in words is "twenty million, two hundred seventeen thousand, nineteen".