20066819 has 2 divisors, whose sum is σ = 20066820. Its totient is φ = 20066818.

The previous prime is 20066803. The next prime is 20066821. The reversal of 20066819 is 91866002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20066819 - 2⁴ = 20066803 is a prime.

It is a super-2 number, since 2×20066819² = 805354449557522, which contains 22 as substring.

Together with 20066821, 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 (20066899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10033409 + 10033410.

It is an arithmetic number, because the mean of its divisors is an integer number (10033410).

Almost surely, 2^20066819 is an apocalyptic number.

20066819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20066819 is an equidigital number, since it uses as much as digits as its factorization.

20066819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20066819 is about 4479.6003169926. The cubic root of 20066819 is about 271.7437167543.

The spelling of 20066819 in words is "twenty million, sixty-six thousand, eight hundred nineteen".