20461866 has 8 divisors (see below), whose sum is σ = 40923744. Its totient is φ = 6820620.

The previous prime is 20461853. The next prime is 20461913. The reversal of 20461866 is 66816402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

20461866 is an admirable number.

It is a Curzon number.

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 in 3 ways as a sum of consecutive naturals, for example, 1705150 + ... + 1705161.

It is an arithmetic number, because the mean of its divisors is an integer number (5115468).

Almost surely, 2^20461866 is an apocalyptic number.

20461866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20461866 is a wasteful number, since it uses less digits than its factorization.

20461866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410316.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20461866 is about 4523.4794130183. The cubic root of 20461866 is about 273.5153757898.

The spelling of 20461866 in words is "twenty million, four hundred sixty-one thousand, eight hundred sixty-six".