20811419 has 2 divisors, whose sum is σ = 20811420. Its totient is φ = 20811418.

The previous prime is 20811409. The next prime is 20811421. The reversal of 20811419 is 91411802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20811419 - 2¹⁶ = 20745883 is a prime.

It is a super-2 number, since 2×20811419² = 866230321587122, which contains 22 as substring.

Together with 20811421, 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 (20811409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10405709 + 10405710.

It is an arithmetic number, because the mean of its divisors is an integer number (10405710).

Almost surely, 2^20811419 is an apocalyptic number.

20811419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20811419 is an equidigital number, since it uses as much as digits as its factorization.

20811419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 20811419 is about 4561.9534193150. The cubic root of 20811419 is about 275.0640908471.

The spelling of 20811419 in words is "twenty million, eight hundred eleven thousand, four hundred nineteen".