20906212 has 6 divisors (see below), whose sum is σ = 36585878. Its totient is φ = 10453104.

The previous prime is 20906203. The next prime is 20906227. The reversal of 20906212 is 21260902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 602176 = 4506^2 + 776^2 .

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 as a sum of consecutive naturals, namely, 2613273 + ... + 2613280.

Almost surely, 2^20906212 is an apocalyptic number.

It is an amenable number.

20906212 is a deficient number, since it is larger than the sum of its proper divisors (15679666).

20906212 is a wasteful number, since it uses less digits than its factorization.

20906212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226557 (or 5226555 counting only the distinct ones).

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

The square root of 20906212 is about 4572.3311341153. The cubic root of 20906212 is about 275.4810840732.

The spelling of 20906212 in words is "twenty million, nine hundred six thousand, two hundred twelve".