20666486 has 4 divisors (see below), whose sum is σ = 30999732. Its totient is φ = 10333242.

The previous prime is 20666453. The next prime is 20666521. The reversal of 20666486 is 68466602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5166620 + ... + 5166623.

It is an arithmetic number, because the mean of its divisors is an integer number (7749933).

Almost surely, 2^20666486 is an apocalyptic number.

20666486 is a deficient number, since it is larger than the sum of its proper divisors (10333246).

20666486 is a wasteful number, since it uses less digits than its factorization.

20666486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10333245.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 20666486 is about 4546.0406949344. The cubic root of 20666486 is about 274.4240773524.

The spelling of 20666486 in words is "twenty million, six hundred sixty-six thousand, four hundred eighty-six".