20995411 has 2 divisors, whose sum is σ = 20995412. Its totient is φ = 20995410.

The previous prime is 20995409. The next prime is 20995421. The reversal of 20995411 is 11459902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20995411 - 2¹ = 20995409 is a prime.

Together with 20995409, 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 (20995421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10497705 + 10497706.

It is an arithmetic number, because the mean of its divisors is an integer number (10497706).

Almost surely, 2^20995411 is an apocalyptic number.

20995411 is a deficient number, since it is larger than the sum of its proper divisors (1).

20995411 is an equidigital number, since it uses as much as digits as its factorization.

20995411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 20995411 is about 4582.0749666499. The cubic root of 20995411 is about 275.8723198201.

The spelling of 20995411 in words is "twenty million, nine hundred ninety-five thousand, four hundred eleven".