20381219 has 2 divisors, whose sum is σ = 20381220. Its totient is φ = 20381218.

The previous prime is 20381213. The next prime is 20381237. The reversal of 20381219 is 91218302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20381219 - 2⁸ = 20380963 is a prime.

It is a super-2 number, since 2×20381219² = 830788175851922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20381213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190609 + 10190610.

It is an arithmetic number, because the mean of its divisors is an integer number (10190610).

Almost surely, 2^20381219 is an apocalyptic number.

20381219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20381219 is an equidigital number, since it uses as much as digits as its factorization.

20381219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20381219 is about 4514.5563458661. The cubic root of 20381219 is about 273.1555643942.

The spelling of 20381219 in words is "twenty million, three hundred eighty-one thousand, two hundred nineteen".