20499687 has 12 divisors (see below), whose sum is σ = 31888584. Its totient is φ = 12615120.

The previous prime is 20499679. The next prime is 20499697. The reversal of 20499687 is 78699402.

It is a happy number.

It is not a de Polignac number, because 20499687 - 2³ = 20499679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499697) 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, 87489 + ... + 87722.

It is an arithmetic number, because the mean of its divisors is an integer number (2657382).

Almost surely, 2^20499687 is an apocalyptic number.

20499687 is a deficient number, since it is larger than the sum of its proper divisors (11388897).

20499687 is a wasteful number, since it uses less digits than its factorization.

20499687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175230 (or 175227 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20499687 is about 4527.6580038691. The cubic root of 20499687 is about 273.6837908310.

The spelling of 20499687 in words is "twenty million, four hundred ninety-nine thousand, six hundred eighty-seven".