20438219 has 2 divisors, whose sum is σ = 20438220. Its totient is φ = 20438218.

The previous prime is 20438203. The next prime is 20438221. The reversal of 20438219 is 91283402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20438219 - 2⁴ = 20438203 is a prime.

It is a super-2 number, since 2×20438219² = 835441591783922, which contains 22 as substring.

Together with 20438221, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20438191 and 20438200.

It is not a weakly prime, because it can be changed into another prime (20438419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219109 + 10219110.

It is an arithmetic number, because the mean of its divisors is an integer number (10219110).

Almost surely, 2^20438219 is an apocalyptic number.

20438219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20438219 is an equidigital number, since it uses as much as digits as its factorization.

20438219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20438219 is about 4520.8648508886. The cubic root of 20438219 is about 273.4099714044.

The spelling of 20438219 in words is "twenty million, four hundred thirty-eight thousand, two hundred nineteen".