20315219 has 2 divisors, whose sum is σ = 20315220. Its totient is φ = 20315218.

The previous prime is 20315203. The next prime is 20315227. The reversal of 20315219 is 91251302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20315219 - 2⁴ = 20315203 is a prime.

It is a super-2 number, since 2×20315219² = 825416246035922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20315194 and 20315203.

It is not a weakly prime, because it can be changed into another prime (20315299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157609 + 10157610.

It is an arithmetic number, because the mean of its divisors is an integer number (10157610).

Almost surely, 2^20315219 is an apocalyptic number.

20315219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315219 is an equidigital number, since it uses as much as digits as its factorization.

20315219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20315219 is about 4507.2407302029. The cubic root of 20315219 is about 272.8603945698.

The spelling of 20315219 in words is "twenty million, three hundred fifteen thousand, two hundred nineteen".