20717487 has 12 divisors (see below), whose sum is σ = 34200400. Its totient is φ = 11838528.

The previous prime is 20717483. The next prime is 20717497. The reversal of 20717487 is 78471702.

It is not a de Polignac number, because 20717487 - 2² = 20717483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717483) 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, 164362 + ... + 164487.

Almost surely, 2^20717487 is an apocalyptic number.

20717487 is a deficient number, since it is larger than the sum of its proper divisors (13482913).

20717487 is a wasteful number, since it uses less digits than its factorization.

20717487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328862 (or 328859 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 20717487 is about 4551.6466251237. The cubic root of 20717487 is about 274.6496342443.

The spelling of 20717487 in words is "twenty million, seven hundred seventeen thousand, four hundred eighty-seven".