20663487 has 12 divisors (see below), whose sum is σ = 32143384. Its totient is φ = 12715920.

The previous prime is 20663473. The next prime is 20663491. The reversal of 20663487 is 78436602.

It is not a de Polignac number, because 20663487 - 2⁴ = 20663471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88189 + ... + 88422.

Almost surely, 2^20663487 is an apocalyptic number.

20663487 is a deficient number, since it is larger than the sum of its proper divisors (11479897).

20663487 is a wasteful number, since it uses less digits than its factorization.

20663487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176630 (or 176627 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20663487 is about 4545.7108355020. The cubic root of 20663487 is about 274.4108024361.

The spelling of 20663487 in words is "twenty million, six hundred sixty-three thousand, four hundred eighty-seven".