20820419 has 2 divisors, whose sum is σ = 20820420. Its totient is φ = 20820418.

The previous prime is 20820413. The next prime is 20820421. The reversal of 20820419 is 91402802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20820419 - 2¹⁶ = 20754883 is a prime.

It is a super-2 number, since 2×20820419² = 866979694671122, which contains 22 as substring.

Together with 20820421, 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 (20820413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410209 + 10410210.

It is an arithmetic number, because the mean of its divisors is an integer number (10410210).

Almost surely, 2^20820419 is an apocalyptic number.

20820419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20820419 is an equidigital number, since it uses as much as digits as its factorization.

20820419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20820419 is about 4562.9397322340. The cubic root of 20820419 is about 275.1037360702.

The spelling of 20820419 in words is "twenty million, eight hundred twenty thousand, four hundred nineteen".