20739211 has 2 divisors, whose sum is σ = 20739212. Its totient is φ = 20739210.

The previous prime is 20739209. The next prime is 20739233. The reversal of 20739211 is 11293702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20739211 - 2¹ = 20739209 is a prime.

It is a super-2 number, since 2×20739211² = 860229745805042, which contains 22 as substring.

Together with 20739209, it forms a pair of twin primes.

It is equal to p_1314529 and since 20739211 and 1314529 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20736211) 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, 10369605 + 10369606.

It is an arithmetic number, because the mean of its divisors is an integer number (10369606).

Almost surely, 2^20739211 is an apocalyptic number.

20739211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20739211 is an equidigital number, since it uses as much as digits as its factorization.

20739211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 20739211 is about 4554.0323889933. The cubic root of 20739211 is about 274.7455983352.

The spelling of 20739211 in words is "twenty million, seven hundred thirty-nine thousand, two hundred eleven".