20107211 has 4 divisors (see below), whose sum is σ = 20535072. Its totient is φ = 19679352.

The previous prime is 20107207. The next prime is 20107223. The reversal of 20107211 is 11270102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11270102 = 2 ⋅5635051.

It is a cyclic number.

It is not a de Polignac number, because 20107211 - 2² = 20107207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20107291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213860 + ... + 213953.

It is an arithmetic number, because the mean of its divisors is an integer number (5133768).

Almost surely, 2^20107211 is an apocalyptic number.

20107211 is a deficient number, since it is larger than the sum of its proper divisors (427861).

20107211 is an equidigital number, since it uses as much as digits as its factorization.

20107211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427860.

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

The square root of 20107211 is about 4484.1064884768. The cubic root of 20107211 is about 271.9259232749.

Adding to 20107211 its reverse (11270102), we get a palindrome (31377313).

The spelling of 20107211 in words is "twenty million, one hundred seven thousand, two hundred eleven".