20666485 has 24 divisors (see below), whose sum is σ = 29302560. Its totient is φ = 13948704.

The previous prime is 20666453. The next prime is 20666521. The reversal of 20666485 is 58466602.

It is not a de Polignac number, because 20666485 - 2⁵ = 20666453 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15786 + ... + 17044.

It is an arithmetic number, because the mean of its divisors is an integer number (1220940).

Almost surely, 2^20666485 is an apocalyptic number.

It is an amenable number.

20666485 is a deficient number, since it is larger than the sum of its proper divisors (8636075).

20666485 is a wasteful number, since it uses less digits than its factorization.

20666485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1338 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 20666485 is about 4546.0405849486. The cubic root of 20666485 is about 274.4240729262.

The spelling of 20666485 in words is "twenty million, six hundred sixty-six thousand, four hundred eighty-five".