20665674 has 24 divisors (see below), whose sum is σ = 44892900. Its totient is φ = 6870528.

The previous prime is 20665669. The next prime is 20665739. The reversal of 20665674 is 47656602.

It can be written as a sum of positive squares in 2 ways, for example, as 20657025 + 8649 = 4545^2 + 93^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6804 + ... + 9360.

Almost surely, 2^20665674 is an apocalyptic number.

20665674 is an abundant number, since it is smaller than the sum of its proper divisors (24227226).

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

20665674 is a wasteful number, since it uses less digits than its factorization.

20665674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014 (or 3011 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 20665674 is about 4545.9513855738. The cubic root of 20665674 is about 274.4204832038.

The spelling of 20665674 in words is "twenty million, six hundred sixty-five thousand, six hundred seventy-four".