20287688 has 16 divisors (see below), whose sum is σ = 38128860. Its totient is φ = 10120000.

The previous prime is 20287637. The next prime is 20287703. The reversal of 20287688 is 88678202.

It can be written as a sum of positive squares in 2 ways, for example, as 19201924 + 1085764 = 4382^2 + 1042^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938 + ... + 6438.

Almost surely, 2^20287688 is an apocalyptic number.

It is an amenable number.

20287688 is a deficient number, since it is larger than the sum of its proper divisors (17841172).

20287688 is a wasteful number, since it uses less digits than its factorization.

20287688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5968 (or 5964 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 20287688 is about 4504.1856089642. The cubic root of 20287688 is about 272.7370795396.

The spelling of 20287688 in words is "twenty million, two hundred eighty-seven thousand, six hundred eighty-eight".