20660858 has 16 divisors (see below), whose sum is σ = 31824576. Its totient is φ = 10056480.

The previous prime is 20660851. The next prime is 20660869. The reversal of 20660858 is 85806602.

It is not an unprimeable number, because it can be changed into a prime (20660851) 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 7 ways as a sum of consecutive naturals, for example, 10910 + ... + 12662.

It is an arithmetic number, because the mean of its divisors is an integer number (1989036).

Almost surely, 2^20660858 is an apocalyptic number.

20660858 is a deficient number, since it is larger than the sum of its proper divisors (11163718).

20660858 is a wasteful number, since it uses less digits than its factorization.

20660858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 20660858 is about 4545.4216526083. The cubic root of 20660858 is about 274.3991642487.

The spelling of 20660858 in words is "twenty million, six hundred sixty thousand, eight hundred fifty-eight".