20145211 has 4 divisors (see below), whose sum is σ = 20333592. Its totient is φ = 19956832.

The previous prime is 20145193. The next prime is 20145233. The reversal of 20145211 is 11254102.

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 20145211 - 2¹⁷ = 20014139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20145241) 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, 94030 + ... + 94243.

It is an arithmetic number, because the mean of its divisors is an integer number (5083398).

Almost surely, 2^20145211 is an apocalyptic number.

20145211 is a deficient number, since it is larger than the sum of its proper divisors (188381).

20145211 is a wasteful number, since it uses less digits than its factorization.

20145211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188380.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20145211 is about 4488.3416759422. The cubic root of 20145211 is about 272.0971169569.

Adding to 20145211 its reverse (11254102), we get a palindrome (31399313).

It can be divided in two parts, 2014 and 5211, that added together give a square (7225 = 85²).

The spelling of 20145211 in words is "twenty million, one hundred forty-five thousand, two hundred eleven".