20947211 has 2 divisors, whose sum is σ = 20947212. Its totient is φ = 20947210.

The previous prime is 20947189. The next prime is 20947229. The reversal of 20947211 is 11274902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20947211 - 2¹⁴ = 20930827 is a prime.

It is equal to p_1326806 and since 20947211 and 1326806 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is not a weakly prime, because it can be changed into another prime (20947271) 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, 10473605 + 10473606.

It is an arithmetic number, because the mean of its divisors is an integer number (10473606).

Almost surely, 2^20947211 is an apocalyptic number.

20947211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20947211 is an equidigital number, since it uses as much as digits as its factorization.

20947211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 20947211 is about 4576.8123186340. The cubic root of 20947211 is about 275.6610477103.

The spelling of 20947211 in words is "twenty million, nine hundred forty-seven thousand, two hundred eleven".