20028211 has 12 divisors (see below), whose sum is σ = 23929968. Its totient is φ = 16701552.

The previous prime is 20028209. The next prime is 20028221. The reversal of 20028211 is 11282002.

It is not a de Polignac number, because 20028211 - 2¹ = 20028209 is a prime.

It is a super-2 number, since 2×20028211² = 802258471721042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20028221) 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 11 ways as a sum of consecutive naturals, for example, 3711 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (1994164).

Almost surely, 2^20028211 is an apocalyptic number.

20028211 is a deficient number, since it is larger than the sum of its proper divisors (3901757).

20028211 is a wasteful number, since it uses less digits than its factorization.

20028211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11098 (or 11091 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 20028211 is about 4475.2889292201. The cubic root of 20028211 is about 271.5693290905.

The spelling of 20028211 in words is "twenty million, twenty-eight thousand, two hundred eleven".