20218346 has 8 divisors (see below), whose sum is σ = 30347460. Its totient is φ = 10102528.

The previous prime is 20218343. The next prime is 20218349. The reversal of 20218346 is 64381202.

It is an interprime number because it is at equal distance from previous prime (20218343) and next prime (20218349).

It can be written as a sum of positive squares in 2 ways, for example, as 20025625 + 192721 = 4475^2 + 439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20218343) 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 3 ways as a sum of consecutive naturals, for example, 2570 + ... + 6858.

Almost surely, 2^20218346 is an apocalyptic number.

20218346 is a deficient number, since it is larger than the sum of its proper divisors (10129114).

20218346 is a wasteful number, since it uses less digits than its factorization.

20218346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6648.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20218346 is about 4496.4815133613. The cubic root of 20218346 is about 272.4259923030.

Adding to 20218346 its reverse (64381202), we get a palindrome (84599548).

The spelling of 20218346 in words is "twenty million, two hundred eighteen thousand, three hundred forty-six".