20870219 has 2 divisors, whose sum is σ = 20870220. Its totient is φ = 20870218.

The previous prime is 20870191. The next prime is 20870231. The reversal of 20870219 is 91207802.

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-20870219 is a prime.

It is a super-2 number, since 2×20870219² = 871132082215922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20870191 and 20870200.

It is not a weakly prime, because it can be changed into another prime (20870249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10435109 + 10435110.

It is an arithmetic number, because the mean of its divisors is an integer number (10435110).

Almost surely, 2^20870219 is an apocalyptic number.

20870219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20870219 is an equidigital number, since it uses as much as digits as its factorization.

20870219 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 20870219 is about 4568.3934813017. The cubic root of 20870219 is about 275.3229000470.

The spelling of 20870219 in words is "twenty million, eight hundred seventy thousand, two hundred nineteen".