20217346 has 16 divisors (see below), whose sum is σ = 31196088. Its totient is φ = 9820800.

The previous prime is 20217343. The next prime is 20217347. The reversal of 20217346 is 64371202.

It can be written as a sum of positive squares in 4 ways, for example, as 15642025 + 4575321 = 3955^2 + 2139^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20217346.

It is not an unprimeable number, because it can be changed into a prime (20217341) 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 7 ways as a sum of consecutive naturals, for example, 30256 + ... + 30916.

Almost surely, 2^20217346 is an apocalyptic number.

20217346 is a deficient number, since it is larger than the sum of its proper divisors (10978742).

20217346 is a wasteful number, since it uses less digits than its factorization.

20217346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20217346 is about 4496.3703139310. The cubic root of 20217346 is about 272.4215008297.

Adding to 20217346 its reverse (64371202), we get a palindrome (84588548).

The spelling of 20217346 in words is "twenty million, two hundred seventeen thousand, three hundred forty-six".