20214809 has 2 divisors, whose sum is σ = 20214810. Its totient is φ = 20214808.

The previous prime is 20214791. The next prime is 20214829. The reversal of 20214809 is 90841202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 4214809 = 4000^2 + 2053^2 .

It is a cyclic number.

It is not a de Polignac number, because 20214809 - 2⁸ = 20214553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20214829) 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, 10107404 + 10107405.

It is an arithmetic number, because the mean of its divisors is an integer number (10107405).

Almost surely, 2^20214809 is an apocalyptic number.

It is an amenable number.

20214809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20214809 is an equidigital number, since it uses as much as digits as its factorization.

20214809 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20214809 is about 4496.0881886369. The cubic root of 20214809 is about 272.4101052974.

The spelling of 20214809 in words is "twenty million, two hundred fourteen thousand, eight hundred nine".