20510219 has 2 divisors, whose sum is σ = 20510220. Its totient is φ = 20510218.

The previous prime is 20510201. The next prime is 20510233. The reversal of 20510219 is 91201502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20510219 - 2²⁴ = 3733003 is a prime.

It is a super-2 number, since 2×20510219² = 841338166855922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20510219.

It is not a weakly prime, because it can be changed into another prime (20510239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10255109 + 10255110.

It is an arithmetic number, because the mean of its divisors is an integer number (10255110).

Almost surely, 2^20510219 is an apocalyptic number.

20510219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20510219 is an equidigital number, since it uses as much as digits as its factorization.

20510219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 20510219 is about 4528.8209282329. The cubic root of 20510219 is about 273.7306524277.

The spelling of 20510219 in words is "twenty million, five hundred ten thousand, two hundred nineteen".