20520211 has 2 divisors, whose sum is σ = 20520212. Its totient is φ = 20520210.

The previous prime is 20520193. The next prime is 20520221. The reversal of 20520211 is 11202502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20520211 - 2⁵ = 20520179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20520191 and 20520200.

It is not a weakly prime, because it can be changed into another prime (20520221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260105 + 10260106.

It is an arithmetic number, because the mean of its divisors is an integer number (10260106).

Almost surely, 2^20520211 is an apocalyptic number.

20520211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520211 is an equidigital number, since it uses as much as digits as its factorization.

20520211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 20520211 is about 4529.9239507965. The cubic root of 20520211 is about 273.7750964947.

Adding to 20520211 its reverse (11202502), we get a palindrome (31722713).

The spelling of 20520211 in words is "twenty million, five hundred twenty thousand, two hundred eleven".