20946347 has 2 divisors, whose sum is σ = 20946348. Its totient is φ = 20946346.

The previous prime is 20946319. The next prime is 20946361. The reversal of 20946347 is 74364902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20946347 - 2¹⁸ = 20684203 is a prime.

It is not a weakly prime, because it can be changed into another prime (20946377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10473173 + 10473174.

It is an arithmetic number, because the mean of its divisors is an integer number (10473174).

Almost surely, 2^20946347 is an apocalyptic number.

20946347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20946347 is an equidigital number, since it uses as much as digits as its factorization.

20946347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20946347 is about 4576.7179288219. The cubic root of 20946347 is about 275.6572576366.

The spelling of 20946347 in words is "twenty million, nine hundred forty-six thousand, three hundred forty-seven".