20218411 has 2 divisors, whose sum is σ = 20218412. Its totient is φ = 20218410.

The previous prime is 20218381. The next prime is 20218427. The reversal of 20218411 is 11481202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20218411 - 2⁵ = 20218379 is a prime.

It is not a weakly prime, because it can be changed into another prime (20218441) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109205 + 10109206.

It is an arithmetic number, because the mean of its divisors is an integer number (10109206).

Almost surely, 2^20218411 is an apocalyptic number.

20218411 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218411 is an equidigital number, since it uses as much as digits as its factorization.

20218411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 20218411 is about 4496.4887412291. The cubic root of 20218411 is about 272.4262842436.

Adding to 20218411 its reverse (11481202), we get a palindrome (31699613).

The spelling of 20218411 in words is "twenty million, two hundred eighteen thousand, four hundred eleven".