20906227 has 2 divisors, whose sum is σ = 20906228. Its totient is φ = 20906226.

The previous prime is 20906203. The next prime is 20906233. The reversal of 20906227 is 72260902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20906227 - 2¹⁹ = 20381939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20906195 and 20906204.

It is not a weakly prime, because it can be changed into another prime (20906257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453113 + 10453114.

It is an arithmetic number, because the mean of its divisors is an integer number (10453114).

Almost surely, 2^20906227 is an apocalyptic number.

20906227 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906227 is an equidigital number, since it uses as much as digits as its factorization.

20906227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20906227 is about 4572.3327744161. The cubic root of 20906227 is about 275.4811499581.

The spelling of 20906227 in words is "twenty million, nine hundred six thousand, two hundred twenty-seven".