20403212 has 12 divisors (see below), whose sum is σ = 36059856. Its totient is φ = 10100400.

The previous prime is 20403197. The next prime is 20403221. The reversal of 20403212 is 21230402.

It is an unprimeable number.

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, 24848 + ... + 25655.

It is an arithmetic number, because the mean of its divisors is an integer number (3004988).

Almost surely, 2^20403212 is an apocalyptic number.

It is an amenable number.

20403212 is a deficient number, since it is larger than the sum of its proper divisors (15656644).

20403212 is a wasteful number, since it uses less digits than its factorization.

20403212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50608 (or 50606 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20403212 is about 4516.9914766357. The cubic root of 20403212 is about 273.2537814629.

Adding to 20403212 its reverse (21230402), we get a palindrome (41633614).

The spelling of 20403212 in words is "twenty million, four hundred three thousand, two hundred twelve".