20701211 has 4 divisors (see below), whose sum is σ = 21369024. Its totient is φ = 20033400.

The previous prime is 20701207. The next prime is 20701229. The reversal of 20701211 is 11210702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20701211 - 2² = 20701207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20701511) 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 in 3 ways as a sum of consecutive naturals, for example, 333860 + ... + 333921.

It is an arithmetic number, because the mean of its divisors is an integer number (5342256).

Almost surely, 2^20701211 is an apocalyptic number.

20701211 is a deficient number, since it is larger than the sum of its proper divisors (667813).

20701211 is an equidigital number, since it uses as much as digits as its factorization.

20701211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667812.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20701211 is about 4549.8583494434. The cubic root of 20701211 is about 274.5776923050.

Adding to 20701211 its reverse (11210702), we get a palindrome (31911913).

The spelling of 20701211 in words is "twenty million, seven hundred one thousand, two hundred eleven".