20461668 has 12 divisors (see below), whose sum is σ = 47743920. Its totient is φ = 6820552.

The previous prime is 20461633. The next prime is 20461673. The reversal of 20461668 is 86616402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852558 + ... + 852581.

It is an arithmetic number, because the mean of its divisors is an integer number (3978660).

Almost surely, 2^20461668 is an apocalyptic number.

It is an amenable number.

20461668 is an abundant number, since it is smaller than the sum of its proper divisors (27282252).

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

20461668 is a wasteful number, since it uses less digits than its factorization.

20461668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705146 (or 1705144 counting only the distinct ones).

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

The square root of 20461668 is about 4523.4575271577. The cubic root of 20461668 is about 273.5144935598.

The spelling of 20461668 in words is "twenty million, four hundred sixty-one thousand, six hundred sixty-eight".