20268866 has 4 divisors (see below), whose sum is σ = 30403302. Its totient is φ = 10134432.

The previous prime is 20268851. The next prime is 20268893. The reversal of 20268866 is 66886202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66886202 = 2 ⋅33443101.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 2163841 = 4255^2 + 1471^2 .

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, 5067215 + ... + 5067218.

Almost surely, 2^20268866 is an apocalyptic number.

20268866 is a deficient number, since it is larger than the sum of its proper divisors (10134436).

20268866 is a wasteful number, since it uses less digits than its factorization.

20268866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10134435.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 20268866 is about 4502.0957342109. The cubic root of 20268866 is about 272.6527090640.

The spelling of 20268866 in words is "twenty million, two hundred sixty-eight thousand, eight hundred sixty-six".