20218349 has 2 divisors, whose sum is σ = 20218350. Its totient is φ = 20218348.

The previous prime is 20218343. The next prime is 20218361. The reversal of 20218349 is 94381202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12124324 + 8094025 = 3482^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 20218349 - 2⁴ = 20218333 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20218343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109174 + 10109175.

It is an arithmetic number, because the mean of its divisors is an integer number (10109175).

Almost surely, 2^20218349 is an apocalyptic number.

It is an amenable number.

20218349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218349 is an equidigital number, since it uses as much as digits as its factorization.

20218349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20218349 is about 4496.4818469555. The cubic root of 20218349 is about 272.4260057772.

The spelling of 20218349 in words is "twenty million, two hundred eighteen thousand, three hundred forty-nine".