20667028 has 24 divisors (see below), whose sum is σ = 37183104. Its totient is φ = 10046400.

The previous prime is 20667013. The next prime is 20667029. The reversal of 20667028 is 82076602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20667029) 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, 39408 + ... + 39928.

It is an arithmetic number, because the mean of its divisors is an integer number (1549296).

Almost surely, 2^20667028 is an apocalyptic number.

It is an amenable number.

20667028 is a deficient number, since it is larger than the sum of its proper divisors (16516076).

20667028 is a wasteful number, since it uses less digits than its factorization.

20667028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20667028 is about 4546.1003068564. The cubic root of 20667028 is about 274.4264763500.

The spelling of 20667028 in words is "twenty million, six hundred sixty-seven thousand, twenty-eight".