20216403 has 12 divisors (see below), whose sum is σ = 29914248. Its totient is φ = 13148640.

The previous prime is 20216387. The next prime is 20216411. The reversal of 20216403 is 30461202.

It is a happy number.

20216403 is a `hidden beast` number, since 2 + 0 + 21 + 640 + 3 = 666.

It is not a de Polignac number, because 20216403 - 2⁴ = 20216387 is a prime.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20216003) 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 11 ways as a sum of consecutive naturals, for example, 27025 + ... + 27762.

It is an arithmetic number, because the mean of its divisors is an integer number (2492854).

Almost surely, 2^20216403 is an apocalyptic number.

20216403 is a deficient number, since it is larger than the sum of its proper divisors (9697845).

20216403 is a wasteful number, since it uses less digits than its factorization.

20216403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54834 (or 54831 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20216403 is about 4496.2654503488. The cubic root of 20216403 is about 272.4172652347.

Adding to 20216403 its reverse (30461202), we get a palindrome (50677605).

The spelling of 20216403 in words is "twenty million, two hundred sixteen thousand, four hundred three".