20780219 has 2 divisors, whose sum is σ = 20780220. Its totient is φ = 20780218.

The previous prime is 20780197. The next prime is 20780237. The reversal of 20780219 is 91208702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20780219 is a prime.

It is a super-2 number, since 2×20780219² = 863635003375922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20780191 and 20780200.

It is not a weakly prime, because it can be changed into another prime (20780119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390109 + 10390110.

It is an arithmetic number, because the mean of its divisors is an integer number (10390110).

Almost surely, 2^20780219 is an apocalyptic number.

20780219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20780219 is an equidigital number, since it uses as much as digits as its factorization.

20780219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20780219 is about 4558.5325489679. The cubic root of 20780219 is about 274.9265655162.

The spelling of 20780219 in words is "twenty million, seven hundred eighty thousand, two hundred nineteen".