20665028 has 6 divisors (see below), whose sum is σ = 36163806. Its totient is φ = 10332512.

The previous prime is 20665019. The next prime is 20665033. The reversal of 20665028 is 82056602.

It can be written as a sum of positive squares in only one way, i.e., 18130564 + 2534464 = 4258^2 + 1592^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583125 + ... + 2583132.

It is an arithmetic number, because the mean of its divisors is an integer number (6027301).

Almost surely, 2^20665028 is an apocalyptic number.

It is an amenable number.

20665028 is a deficient number, since it is larger than the sum of its proper divisors (15498778).

20665028 is a wasteful number, since it uses less digits than its factorization.

20665028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166261 (or 5166259 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20665028 is about 4545.8803327848. The cubic root of 20665028 is about 274.4176237523.

The spelling of 20665028 in words is "twenty million, six hundred sixty-five thousand, twenty-eight".