20984219 has 2 divisors, whose sum is σ = 20984220. Its totient is φ = 20984218.

The previous prime is 20984209. The next prime is 20984221. The reversal of 20984219 is 91248902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20984219 - 2²⁴ = 4207003 is a prime.

It is a super-2 number, since 2×20984219² = 880674894079922, which contains 22 as substring.

Together with 20984221, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20984209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10492109 + 10492110.

It is an arithmetic number, because the mean of its divisors is an integer number (10492110).

Almost surely, 2^20984219 is an apocalyptic number.

20984219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20984219 is an equidigital number, since it uses as much as digits as its factorization.

20984219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 20984219 is about 4580.8535230893. The cubic root of 20984219 is about 275.8232914587.

The spelling of 20984219 in words is "twenty million, nine hundred eighty-four thousand, two hundred nineteen".