20912330 has 16 divisors (see below), whose sum is σ = 38066760. Its totient is φ = 8270592.

The previous prime is 20912317. The next prime is 20912341. The reversal of 20912330 is 3321902.

It is a Cunningham number, because it is equal to 4573²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 16556761 + 4355569 = 4069^2 + 2087^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10859 + ... + 12638.

Almost surely, 2^20912330 is an apocalyptic number.

20912330 is a deficient number, since it is larger than the sum of its proper divisors (17154430).

20912330 is a wasteful number, since it uses less digits than its factorization.

20912330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23593.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20912330 is about 4573.0001093374. Note that the first 3 decimals coincide. The cubic root of 20912330 is about 275.5079537407.

The spelling of 20912330 in words is "twenty million, nine hundred twelve thousand, three hundred thirty".