20681211 has 16 divisors (see below), whose sum is σ = 28206720. Its totient is φ = 13474560.

The previous prime is 20681207. The next prime is 20681233. The reversal of 20681211 is 11218602.

It is not a de Polignac number, because 20681211 - 2² = 20681207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20681201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58411 + ... + 58763.

It is an arithmetic number, because the mean of its divisors is an integer number (1762920).

Almost surely, 2^20681211 is an apocalyptic number.

20681211 is a deficient number, since it is larger than the sum of its proper divisors (7525509).

20681211 is a wasteful number, since it uses less digits than its factorization.

20681211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 20681211 is about 4547.6599477094. The cubic root of 20681211 is about 274.4892381672.

Adding to 20681211 its reverse (11218602), we get a palindrome (31899813).

The spelling of 20681211 in words is "twenty million, six hundred eighty-one thousand, two hundred eleven".