20216290 has 8 divisors (see below), whose sum is σ = 36389340. Its totient is φ = 8086512.

The previous prime is 20216263. The next prime is 20216297. The reversal of 20216290 is 9261202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20187049 + 29241 = 4493^2 + 171^2 .

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 (20216297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010805 + ... + 1010824.

Almost surely, 2^20216290 is an apocalyptic number.

20216290 is a deficient number, since it is larger than the sum of its proper divisors (16173050).

20216290 is a wasteful number, since it uses less digits than its factorization.

20216290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021636.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20216290 is about 4496.2528843471. The cubic root of 20216290 is about 272.4167576731.

Adding to 20216290 its reverse (9261202), we get a palindrome (29477492).

The spelling of 20216290 in words is "twenty million, two hundred sixteen thousand, two hundred ninety".