20218343 has 2 divisors, whose sum is σ = 20218344. Its totient is φ = 20218342.

The previous prime is 20218333. The next prime is 20218349. The reversal of 20218343 is 34381202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20218343 - 2¹⁰ = 20217319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20218349) 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, 10109171 + 10109172.

It is an arithmetic number, because the mean of its divisors is an integer number (10109172).

Almost surely, 2^20218343 is an apocalyptic number.

20218343 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218343 is an equidigital number, since it uses as much as digits as its factorization.

20218343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20218343 is about 4496.4811797671. The cubic root of 20218343 is about 272.4259788288.

Adding to 20218343 its reverse (34381202), we get a palindrome (54599545).

The spelling of 20218343 in words is "twenty million, two hundred eighteen thousand, three hundred forty-three".