20218311 has 12 divisors (see below), whose sum is σ = 30474288. Its totient is φ = 12892704.

The previous prime is 20218291. The next prime is 20218313. The reversal of 20218311 is 11381202.

It is not a de Polignac number, because 20218311 - 2⁷ = 20218183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20218313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48630 + ... + 49043.

It is an arithmetic number, because the mean of its divisors is an integer number (2539524).

Almost surely, 2^20218311 is an apocalyptic number.

20218311 is a deficient number, since it is larger than the sum of its proper divisors (10255977).

20218311 is a wasteful number, since it uses less digits than its factorization.

20218311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97702 (or 97699 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 20218311 is about 4496.4776214277. The cubic root of 20218311 is about 272.4258351039.

Adding to 20218311 its reverse (11381202), we get a palindrome (31599513).

The spelling of 20218311 in words is "twenty million, two hundred eighteen thousand, three hundred eleven".