20704219 has 2 divisors, whose sum is σ = 20704220. Its totient is φ = 20704218.

The previous prime is 20704217. The next prime is 20704253. The reversal of 20704219 is 91240702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20704219 - 2¹ = 20704217 is a prime.

It is a super-2 number, since 2×20704219² = 857329368799922, which contains 22 as substring.

Together with 20704217, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20704193 and 20704202.

It is not a weakly prime, because it can be changed into another prime (20704213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352109 + 10352110.

It is an arithmetic number, because the mean of its divisors is an integer number (10352110).

Almost surely, 2^20704219 is an apocalyptic number.

20704219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704219 is an equidigital number, since it uses as much as digits as its factorization.

20704219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20704219 is about 4550.1888971778. The cubic root of 20704219 is about 274.5909908780.

The spelling of 20704219 in words is "twenty million, seven hundred four thousand, two hundred nineteen".