20912306 has 12 divisors (see below), whose sum is σ = 32490042. Its totient is φ = 10094784.

The previous prime is 20912303. The next prime is 20912317. The reversal of 20912306 is 60321902.

It can be written as a sum of positive squares in 3 ways, for example, as 14707225 + 6205081 = 3835^2 + 2491^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20912303) 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 5 ways as a sum of consecutive naturals, for example, 4535 + ... + 7898.

Almost surely, 2^20912306 is an apocalyptic number.

20912306 is a deficient number, since it is larger than the sum of its proper divisors (11577736).

20912306 is a wasteful number, since it uses less digits than its factorization.

20912306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12493 (or 12464 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20912306 is about 4572.9974852388. The cubic root of 20912306 is about 275.5078483452.

Adding to 20912306 its sum of digits (23), we get a square (20912329 = 4573²).

The spelling of 20912306 in words is "twenty million, nine hundred twelve thousand, three hundred six".