20942216 has 8 divisors (see below), whose sum is σ = 39266670. Its totient is φ = 10471104.

The previous prime is 20942209. The next prime is 20942219. The reversal of 20942216 is 61224902.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 2709316 = 4270^2 + 1646^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20942219) 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 as a sum of consecutive naturals, namely, 1308881 + ... + 1308896.

Almost surely, 2^20942216 is an apocalyptic number.

It is an amenable number.

20942216 is a deficient number, since it is larger than the sum of its proper divisors (18324454).

20942216 is a wasteful number, since it uses less digits than its factorization.

20942216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617783 (or 2617779 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20942216 is about 4576.2666006254. The cubic root of 20942216 is about 275.6391349062.

The spelling of 20942216 in words is "twenty million, nine hundred forty-two thousand, two hundred sixteen".